feat: add settings and access dashboard slice

apps/dashboard/src/features/settings/access-panel.tsx

@@ -0,0 +1,59 @@
+import { useLoginInfoQuery, useLoginStatusQuery, useStartLoginMutation } from './settings-queries.js';
+
+function errorMessage(error: Error | null): string {
+  return error?.message ?? 'Something went wrong.';
+}
+
+function sessionLabel(status: ReturnType<typeof useLoginStatusQuery>['data']): string {
+  if (!status) return 'Unknown';
+  if (!status.ready) return 'Browser unavailable';
+  if ('error' in status) return 'Check failed';
+  return {
+    unknown: 'Unknown',
+    authenticated: 'Authenticated',
+    'login-required': 'Login required',
+    unreachable: 'Reddit unreachable',
+  }[status.status];
+}
+
+function noVncUrl(publicUrl: string | null, port: number): string {
+  if (publicUrl) return publicUrl;
+  return `${window.location.protocol}//${window.location.hostname}:${port}/vnc.html?autoconnect=true&resize=scale`;
+}
+
+export function AccessPanel() {
+  const infoQuery = useLoginInfoQuery();
+  const statusQuery = useLoginStatusQuery();
+  const loginMutation = useStartLoginMutation();
+
+  if (infoQuery.isPending || statusQuery.isPending) {
+    return <section aria-label="Loading access" className="panel panel-loading" role="status"><span className="spinner" />Loading Reddit access…</section>;
+  }
+
+  if (infoQuery.isError || statusQuery.isError) {
+    const error = infoQuery.error ?? statusQuery.error;
+    return (
+      <section className="panel error-panel" role="alert">
+        <strong>Reddit access unavailable</strong><span>{errorMessage(error)}</span>
+        <button className="button secondary" onClick={() => void Promise.all([infoQuery.refetch(), statusQuery.refetch()])} type="button">Retry access</button>
+      </section>
+    );
+  }
+
+  const info = infoQuery.data;
+  return (
+    <section aria-labelledby="access-heading" className="panel settings-section">
+      <div className="panel-heading"><div><span className="eyebrow">Browser session</span><h2 id="access-heading">Access</h2></div><span className={statusQuery.data.ready && 'status' in statusQuery.data && statusQuery.data.loggedIn ? 'pill success' : 'pill warning'}>{sessionLabel(statusQuery.data)}</span></div>
+      <p className="settings-copy">Open Reddit in the managed browser, complete login through noVNC, then recheck the session. Credentials are never entered or displayed here.</p>
+      <div className="access-actions">
+        <button className="button primary" disabled={loginMutation.isPending} onClick={() => loginMutation.mutate()} type="button">{loginMutation.isPending ? 'Opening login…' : 'Open Reddit login'}</button>
+        <button className="button secondary" disabled={statusQuery.isFetching} onClick={() => void statusQuery.refetch()} type="button">{statusQuery.isFetching ? 'Checking session…' : 'Recheck session'}</button>
+        {info.vncEnabled ? <a className="button secondary" href={noVncUrl(info.publicUrl, info.novncPort)} rel="noreferrer" target="_blank">Open noVNC login window</a> : null}
+      </div>
+      {!info.vncEnabled ? <div className="settings-notice warning" role="status">noVNC is not available in this deployment.</div> : null}
+      {info.passwordRequired ? <p className="settings-copy">A VNC password is required.</p> : null}
+      {loginMutation.isSuccess ? <div className="settings-notice success" role="status">Login page opened.</div> : null}
+      {loginMutation.isError ? <div className="settings-notice error" role="alert">{errorMessage(loginMutation.error)}</div> : null}
+    </section>
+  );
+}

apps/dashboard/src/features/settings/risk-dialog.tsx

@@ -0,0 +1,34 @@
+import { useEffect, useRef } from 'react';
+
+interface RiskDialogProps {
+  reasons: string[];
+  isPending: boolean;
+  onCancel(): void;
+  onConfirm(): void;
+}
+
+export function RiskDialog({ reasons, isPending, onCancel, onConfirm }: RiskDialogProps) {
+  const cancelButtonRef = useRef<HTMLButtonElement>(null);
+
+  useEffect(() => {
+    cancelButtonRef.current?.focus();
+  }, []);
+
+  return (
+    <div aria-labelledby="risk-settings-title" aria-modal="true" className="dialog-backdrop" role="dialog">
+      <div className="dialog-card">
+        <span className="eyebrow">Confirm operational risk</span>
+        <h2 id="risk-settings-title">Confirm risky settings</h2>
+        <ul className="risk-list">
+          {reasons.map((reason) => <li key={reason}>{reason}</li>)}
+        </ul>
+        <div className="dialog-actions">
+          <button className="button secondary" disabled={isPending} onClick={onCancel} ref={cancelButtonRef} type="button">Cancel</button>
+          <button className="button danger" disabled={isPending} onClick={onConfirm} type="button">
+            {isPending ? 'Applying…' : 'Apply risky settings'}
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+}

apps/dashboard/src/features/settings/settings-api.ts

@@ -0,0 +1,58 @@
+import type { ZodType } from 'zod';
+import {
+  ConfigResponseSchema,
+  ConfigUpdateRequestSchema,
+  ConfigUpdateResponseSchema,
+  ErrorResponseSchema,
+  LoginInfoResponseSchema,
+  LoginStartResponseSchema,
+  LoginStatusResponseSchema,
+  type ConfigResponse,
+  type ConfigUpdateRequest,
+  type LoginStatusResponse,
+} from '../../../../../packages/api-contracts/src/index.js';
+
+async function parseResponse<T>(response: Response, schema: ZodType<T>): Promise<T> {
+  const payload: unknown = await response.json();
+  if (!response.ok) {
+    const parsedError = ErrorResponseSchema.safeParse(payload);
+    throw new Error(parsedError.success ? parsedError.data.error : `Request failed (${response.status})`);
+  }
+  return schema.parse(payload);
+}
+
+function request(path: string, init?: RequestInit): Promise<Response> {
+  return globalThis.fetch(path, { credentials: 'same-origin', ...init });
+}
+
+export function fetchSettings(): Promise<ConfigResponse> {
+  return request('/api/config').then((response) => parseResponse(response, ConfigResponseSchema));
+}
+
+export async function saveSettings(updates: ConfigUpdateRequest) {
+  const body = ConfigUpdateRequestSchema.parse(updates);
+  return parseResponse(
+    await request('/api/config', {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(body),
+    }),
+    ConfigUpdateResponseSchema,
+  );
+}
+
+export function fetchLoginInfo() {
+  return request('/api/login/info').then((response) => parseResponse(response, LoginInfoResponseSchema));
+}
+
+export function fetchLoginStatus(): Promise<LoginStatusResponse> {
+  return request('/api/login/status').then((response) => parseResponse(response, LoginStatusResponseSchema));
+}
+
+export async function startLogin(): Promise<void> {
+  const response = await parseResponse(
+    await request('/api/login/start', { method: 'POST' }),
+    LoginStartResponseSchema,
+  );
+  if (!response.ok) throw new Error(response.error);
+}

apps/dashboard/src/features/settings/settings-editor.tsx

@@ -0,0 +1,117 @@
+import { useEffect, useState } from 'react';
+import type { ConfigResponse, ConfigUpdateRequest } from '../../../../../packages/api-contracts/src/index.js';
+import { AccessPanel } from './access-panel.js';
+import { RiskDialog } from './risk-dialog.js';
+import { useSaveSettingsMutation } from './settings-queries.js';
+import { createSettingsDraft, isDraftDirty, validateSettingsDraft, type SettingsDraft } from './settings-model.js';
+import { BehaviourSection, MonitoringSection, RateLimitsSection } from './settings-sections.js';
+import type { SettingsSection } from './settings-page.js';
+
+interface SettingsEditorProps {
+  config: ConfigResponse;
+  section: SettingsSection;
+}
+
+interface PendingRiskySave {
+  payload: ConfigUpdateRequest;
+  reasons: string[];
+}
+
+function errorMessage(error: Error | null): string {
+  return error?.message ?? 'Something went wrong.';
+}
+
+export function SettingsEditor({ config, section }: SettingsEditorProps) {
+  const [persistedDraft, setPersistedDraft] = useState<SettingsDraft>(() => createSettingsDraft(config));
+  const [draft, setDraft] = useState<SettingsDraft>(persistedDraft);
+  const [errors, setErrors] = useState<Record<string, string>>({});
+  const [pendingRiskySave, setPendingRiskySave] = useState<PendingRiskySave | null>(null);
+  const saveMutation = useSaveSettingsMutation();
+  const isDirty = isDraftDirty(draft, persistedDraft);
+
+  useEffect(() => {
+    function warnBeforeUnload(event: BeforeUnloadEvent) {
+      if (!isDirty) return;
+      event.preventDefault();
+      event.returnValue = '';
+    }
+    window.addEventListener('beforeunload', warnBeforeUnload);
+    return () => window.removeEventListener('beforeunload', warnBeforeUnload);
+  }, [isDirty]);
+
+  function applySavedResponse(response: Awaited<ReturnType<typeof saveMutation.mutateAsync>>) {
+    const nextConfig: ConfigResponse = {
+      ...response.config,
+      subreddits: response.subreddits,
+      tones: config.tones,
+    };
+    const nextDraft = createSettingsDraft(nextConfig);
+    setPersistedDraft(nextDraft);
+    setDraft(nextDraft);
+    setPendingRiskySave(null);
+  }
+
+  function submit(payload: ConfigUpdateRequest) {
+    saveMutation.mutate(payload, { onSuccess: applySavedResponse });
+  }
+
+  function updateDraft(nextDraft: SettingsDraft) {
+    saveMutation.reset();
+    setErrors({});
+    setDraft(nextDraft);
+  }
+
+  function prepareSave() {
+    saveMutation.reset();
+    const validation = validateSettingsDraft(draft);
+    setErrors(validation.errors);
+    if (!validation.data) return;
+
+    const reasons: string[] = [];
+    if (persistedDraft.dryRun && !validation.data.dryRun) {
+      reasons.push('Automated messages will be sent to Reddit because dry run mode is being disabled.');
+    }
+    const persistedLimit = Number(persistedDraft.maxMessagesPerHour);
+    if (validation.data.maxMessagesPerHour > 20 && validation.data.maxMessagesPerHour > persistedLimit) {
+      reasons.push(`The limit will allow ${validation.data.maxMessagesPerHour} messages per hour.`);
+    }
+
+    if (reasons.length > 0) {
+      setPendingRiskySave({ payload: validation.data.payload, reasons });
+      return;
+    }
+    submit(validation.data.payload);
+  }
+
+  return (
+    <>
+      {section === 'monitoring' ? <MonitoringSection draft={draft} errors={errors} onChange={updateDraft} /> : null}
+      {section === 'rate-limits' ? <RateLimitsSection draft={draft} errors={errors} onChange={updateDraft} /> : null}
+      {section === 'behaviour' ? <BehaviourSection config={config} draft={draft} errors={errors} onChange={updateDraft} /> : null}
+      {section === 'access' ? <AccessPanel /> : null}
+
+      {section !== 'access' ? (
+        <div className="settings-save-bar">
+          <div aria-live="polite">
+            {isDirty ? <span role="status">You have unsaved changes.</span> : <span>All changes saved.</span>}
+            {saveMutation.isSuccess ? <strong className="save-success">Settings saved.</strong> : null}
+            {saveMutation.isError ? <strong className="save-error" role="alert">{errorMessage(saveMutation.error)}</strong> : null}
+          </div>
+          <div className="header-actions">
+            <button className="button secondary" disabled={!isDirty || saveMutation.isPending} onClick={() => { setDraft(persistedDraft); setErrors({}); saveMutation.reset(); }} type="button">Reset changes</button>
+            <button aria-label={saveMutation.isPending ? 'Saving settings' : 'Save settings'} className="button primary" disabled={!isDirty || saveMutation.isPending} onClick={prepareSave} type="button">{saveMutation.isPending ? 'Saving…' : 'Save settings'}</button>
+          </div>
+        </div>
+      ) : null}
+
+      {pendingRiskySave ? (
+        <RiskDialog
+          isPending={saveMutation.isPending}
+          onCancel={() => setPendingRiskySave(null)}
+          onConfirm={() => submit(pendingRiskySave.payload)}
+          reasons={pendingRiskySave.reasons}
+        />
+      ) : null}
+    </>
+  );
+}

apps/dashboard/src/features/settings/settings-model.ts

@@ -0,0 +1,142 @@
+import { z } from 'zod';
+import {
+  ConfigUpdateRequestSchema,
+  SubredditConfigSchema,
+  ToneKeySchema,
+  type ConfigResponse,
+  type ConfigUpdateRequest,
+} from '../../../../../packages/api-contracts/src/index.js';
+
+export interface SubredditDraft {
+  name: string;
+  type: 'image' | 'chat';
+  weight: string;
+  tone: z.infer<typeof ToneKeySchema>;
+  scripted: string;
+}
+
+export interface SettingsDraft {
+  minDelayMinutes: string;
+  maxMessagesPerHour: string;
+  jitterSeconds: string;
+  dryRun: boolean;
+  prioritizeRecentPosts: boolean;
+  recentWindowMinutes: string;
+  subreddits: SubredditDraft[];
+}
+
+export interface ValidatedSettings {
+  payload: ConfigUpdateRequest;
+  dryRun: boolean;
+  maxMessagesPerHour: number;
+}
+
+export interface SettingsValidationResult {
+  data?: ValidatedSettings;
+  errors: Record<string, string>;
+}
+
+const EditableSubredditSchema = SubredditConfigSchema.extend({
+  name: z.string().trim().min(1, 'Subreddit name is required.'),
+  weight: z.number().positive('Subreddit weight must be greater than 0.').optional(),
+});
+
+const ValidatedSettingsSchema = z.strictObject({
+  minDelayMinutes: z.number().finite().min(0, 'Minimum delay cannot be negative.'),
+  maxMessagesPerHour: z.number().int().min(1, 'Maximum messages per hour must be at least 1.'),
+  jitterSeconds: z.number().finite().min(0, 'Jitter cannot be negative.'),
+  dryRun: z.boolean(),
+  prioritizeRecentPosts: z.boolean(),
+  recentWindowMinutes: z.number().finite().positive('Recent window must be greater than 0 minutes.'),
+  subreddits: z.array(EditableSubredditSchema).min(1, 'At least one subreddit is required.'),
+}).superRefine((value, context) => {
+  const names = value.subreddits.map((subreddit) => subreddit.name.trim().toLowerCase());
+  if (new Set(names).size !== names.length) {
+    context.addIssue({ code: 'custom', path: ['subreddits'], message: 'Subreddit names must be unique.' });
+  }
+});
+
+export function createSettingsDraft(config: ConfigResponse): SettingsDraft {
+  return {
+    minDelayMinutes: String(config.rateLimit.minDelayBetweenMessagesMs / 60_000),
+    maxMessagesPerHour: String(config.rateLimit.maxMessagesPerHour),
+    jitterSeconds: String(config.rateLimit.jitterMs / 1_000),
+    dryRun: config.browser.dryRun,
+    prioritizeRecentPosts: config.reddit.prioritizeRecentPosts,
+    recentWindowMinutes: String(config.reddit.recentWindowMinutes),
+    subreddits: config.subreddits.map((subreddit) => ({
+      name: subreddit.name,
+      type: subreddit.type,
+      weight: subreddit.weight === undefined ? '' : String(subreddit.weight),
+      tone: subreddit.tone,
+      scripted: subreddit.scripted ?? '',
+    })),
+  };
+}
+
+export function validateSettingsDraft(draft: SettingsDraft): SettingsValidationResult {
+  const requiredErrors: Record<string, string> = {};
+  if (draft.minDelayMinutes.trim() === '') requiredErrors.minDelayMinutes = 'Minimum delay is required.';
+  if (draft.maxMessagesPerHour.trim() === '') requiredErrors.maxMessagesPerHour = 'Maximum messages per hour is required.';
+  if (draft.jitterSeconds.trim() === '') requiredErrors.jitterSeconds = 'Jitter is required.';
+  if (draft.recentWindowMinutes.trim() === '') requiredErrors.recentWindowMinutes = 'Recent window is required.';
+  draft.subreddits.forEach((subreddit, index) => {
+    if (subreddit.name.trim() === '') requiredErrors[`subreddits.${index}.name`] = 'Subreddit name is required.';
+    if (subreddit.weight.trim() !== '' && Number(subreddit.weight) <= 0) {
+      requiredErrors[`subreddits.${index}.weight`] = 'Subreddit weight must be greater than 0.';
+    }
+  });
+  if (Object.keys(requiredErrors).length > 0) return { errors: requiredErrors };
+
+  const parsed = ValidatedSettingsSchema.safeParse({
+    minDelayMinutes: Number(draft.minDelayMinutes),
+    maxMessagesPerHour: Number(draft.maxMessagesPerHour),
+    jitterSeconds: Number(draft.jitterSeconds),
+    dryRun: draft.dryRun,
+    prioritizeRecentPosts: draft.prioritizeRecentPosts,
+    recentWindowMinutes: Number(draft.recentWindowMinutes),
+    subreddits: draft.subreddits.map((subreddit) => ({
+      name: subreddit.name.trim(),
+      type: subreddit.type,
+      weight: subreddit.weight.trim() === '' ? undefined : Number(subreddit.weight),
+      tone: subreddit.tone,
+      scripted: subreddit.scripted.trim() === '' ? undefined : subreddit.scripted,
+    })),
+  });
+
+  if (!parsed.success) {
+    const errors: Record<string, string> = {};
+    for (const issue of parsed.error.issues) {
+      const path = issue.path.join('.');
+      if (!(path in errors)) errors[path] = issue.message;
+    }
+    return { errors };
+  }
+
+  const payload = ConfigUpdateRequestSchema.parse({
+    rateLimit: {
+      minDelayBetweenMessagesMs: parsed.data.minDelayMinutes * 60_000,
+      maxMessagesPerHour: parsed.data.maxMessagesPerHour,
+      jitterMs: parsed.data.jitterSeconds * 1_000,
+    },
+    browser: { dryRun: parsed.data.dryRun },
+    reddit: {
+      prioritizeRecentPosts: parsed.data.prioritizeRecentPosts,
+      recentWindowMinutes: parsed.data.recentWindowMinutes,
+    },
+    subreddits: parsed.data.subreddits,
+  });
+
+  return {
+    data: {
+      payload,
+      dryRun: parsed.data.dryRun,
+      maxMessagesPerHour: parsed.data.maxMessagesPerHour,
+    },
+    errors: {},
+  };
+}
+
+export function isDraftDirty(draft: SettingsDraft, persisted: SettingsDraft): boolean {
+  return JSON.stringify(draft) !== JSON.stringify(persisted);
+}

apps/dashboard/src/features/settings/settings-page.tsx

@@ -0,0 +1,44 @@
+import { SettingsEditor } from './settings-editor.js';
+import { useSettingsQuery } from './settings-queries.js';
+import './settings.css';
+
+export type SettingsSection = 'monitoring' | 'rate-limits' | 'behaviour' | 'access';
+
+interface SettingsPageProps {
+  section: SettingsSection;
+  onSectionChange(section: SettingsSection): void;
+}
+
+const sections: ReadonlyArray<{ id: SettingsSection; label: string; description: string }> = [
+  { id: 'monitoring', label: 'Monitoring', description: 'Post discovery and recency' },
+  { id: 'rate-limits', label: 'Rate limits', description: 'Sending pace and safeguards' },
+  { id: 'behaviour', label: 'Behaviour', description: 'Dry run and subreddits' },
+  { id: 'access', label: 'Access', description: 'Reddit browser session' },
+];
+
+function errorMessage(error: Error | null): string {
+  return error?.message ?? 'Something went wrong.';
+}
+
+export function SettingsPage({ section, onSectionChange }: SettingsPageProps) {
+  const settingsQuery = useSettingsQuery();
+
+  return (
+    <div className="page settings-page">
+      <header className="page-header">
+        <div><span className="eyebrow">Platform configuration</span><h1>Settings</h1><p>Manage supported runtime behaviour and Reddit browser access.</p></div>
+      </header>
+      <nav aria-label="Settings sections" className="settings-navigation">
+        {sections.map((item) => (
+          <button aria-current={section === item.id ? 'page' : undefined} aria-label={item.label} className={section === item.id ? 'is-active' : ''} key={item.id} onClick={() => onSectionChange(item.id)} type="button"><strong>{item.label}</strong><small>{item.description}</small></button>
+        ))}
+      </nav>
+
+      {settingsQuery.isPending ? <div aria-label="Loading settings" className="page-state settings-loading" role="status"><span className="spinner" />Loading settings…</div> : null}
+      {settingsQuery.isError ? (
+        <div className="page-state error-state settings-loading" role="alert"><strong>Settings unavailable</strong><span>{errorMessage(settingsQuery.error)}</span><button className="button secondary" onClick={() => void settingsQuery.refetch()} type="button">Retry settings</button></div>
+      ) : null}
+      {settingsQuery.data ? <SettingsEditor config={settingsQuery.data} section={section} /> : null}
+    </div>
+  );
+}

apps/dashboard/src/features/settings/settings-queries.ts

@@ -0,0 +1,45 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
+import type { ConfigResponse } from '../../../../../packages/api-contracts/src/index.js';
+import { fetchLoginInfo, fetchLoginStatus, fetchSettings, saveSettings, startLogin } from './settings-api.js';
+
+export const settingsQueryKeys = {
+  config: ['dashboard', 'config'] as const,
+  loginInfo: ['dashboard', 'login', 'info'] as const,
+  loginStatus: ['dashboard', 'login', 'status'] as const,
+};
+
+export function useSettingsQuery() {
+  return useQuery({ queryKey: settingsQueryKeys.config, queryFn: fetchSettings });
+}
+
+export function useSaveSettingsMutation() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: saveSettings,
+    onSuccess(response) {
+      queryClient.setQueryData<ConfigResponse>(settingsQueryKeys.config, (current) => ({
+        ...response.config,
+        subreddits: response.subreddits,
+        tones: current?.tones ?? [],
+      }));
+    },
+  });
+}
+
+export function useLoginInfoQuery() {
+  return useQuery({ queryKey: settingsQueryKeys.loginInfo, queryFn: fetchLoginInfo });
+}
+
+export function useLoginStatusQuery() {
+  return useQuery({ queryKey: settingsQueryKeys.loginStatus, queryFn: fetchLoginStatus });
+}
+
+export function useStartLoginMutation() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: startLogin,
+    onSuccess() {
+      void queryClient.invalidateQueries({ queryKey: settingsQueryKeys.loginStatus });
+    },
+  });
+}

apps/dashboard/src/features/settings/settings-route.tsx

@@ -0,0 +1,19 @@
+import { useSearchParams } from 'react-router-dom';
+import { SettingsPage, type SettingsSection } from './settings-page.js';
+
+const validSections: readonly SettingsSection[] = ['monitoring', 'rate-limits', 'behaviour', 'access'];
+
+function parseSection(value: string | null): SettingsSection {
+  return validSections.find((section) => section === value) ?? 'monitoring';
+}
+
+export function SettingsRoute() {
+  const [searchParams, setSearchParams] = useSearchParams();
+  const section = parseSection(searchParams.get('section'));
+
+  function selectSection(nextSection: SettingsSection) {
+    setSearchParams({ section: nextSection }, { replace: true });
+  }
+
+  return <SettingsPage onSectionChange={selectSection} section={section} />;
+}

apps/dashboard/src/features/settings/settings-sections.tsx

@@ -0,0 +1,209 @@
+import type { ConfigResponse } from '../../../../../packages/api-contracts/src/index.js';
+import type { SettingsDraft, SubredditDraft } from './settings-model.js';
+
+interface SectionProps {
+  draft: SettingsDraft;
+  errors: Record<string, string>;
+  onChange(next: SettingsDraft): void;
+}
+
+interface NumberFieldProps {
+  error?: string;
+  label: string;
+  name: string;
+  min?: number;
+  value: string;
+  onChange(value: string): void;
+}
+
+function NumberField({ error, label, name, min, value, onChange }: NumberFieldProps) {
+  const errorId = `${name}-error`;
+  return (
+    <label className="settings-field">
+      <span>{label}</span>
+      <input
+        aria-describedby={error ? errorId : undefined}
+        aria-invalid={error ? 'true' : undefined}
+        aria-label={label}
+        min={min}
+        name={name}
+        onChange={(event) => onChange(event.target.value)}
+        step="1"
+        type="number"
+        value={value}
+      />
+      {error ? <small className="field-error" id={errorId}>{error}</small> : null}
+    </label>
+  );
+}
+
+export function MonitoringSection({ draft, errors, onChange }: SectionProps) {
+  return (
+    <section aria-labelledby="monitoring-heading" className="panel settings-section">
+      <div className="panel-heading"><div><span className="eyebrow">Discovery</span><h2 id="monitoring-heading">Monitoring</h2></div></div>
+      <label className="toggle-field">
+        <input
+          aria-label="Prioritise recent posts"
+          checked={draft.prioritizeRecentPosts}
+          onChange={(event) => onChange({ ...draft, prioritizeRecentPosts: event.target.checked })}
+          type="checkbox"
+        />
+        <span><strong>Prioritise recent posts</strong><small>Prefer posts inside the configured recent window.</small></span>
+      </label>
+      <NumberField
+        error={errors.recentWindowMinutes}
+        label="Recent window in minutes"
+        min={1}
+        name="recent-window"
+        onChange={(recentWindowMinutes) => onChange({ ...draft, recentWindowMinutes })}
+        value={draft.recentWindowMinutes}
+      />
+    </section>
+  );
+}
+
+export function RateLimitsSection({ draft, errors, onChange }: SectionProps) {
+  return (
+    <section aria-labelledby="rate-limits-heading" className="panel settings-section">
+      <div className="panel-heading"><div><span className="eyebrow">Sending safeguards</span><h2 id="rate-limits-heading">Rate limits</h2></div></div>
+      <div className="settings-grid">
+        <NumberField
+          error={errors.minDelayMinutes}
+          label="Minimum delay in minutes"
+          min={0}
+          name="minimum-delay"
+          onChange={(minDelayMinutes) => onChange({ ...draft, minDelayMinutes })}
+          value={draft.minDelayMinutes}
+        />
+        <NumberField
+          error={errors.maxMessagesPerHour}
+          label="Maximum messages per hour"
+          min={1}
+          name="hourly-limit"
+          onChange={(maxMessagesPerHour) => onChange({ ...draft, maxMessagesPerHour })}
+          value={draft.maxMessagesPerHour}
+        />
+        <NumberField
+          error={errors.jitterSeconds}
+          label="Random jitter in seconds"
+          min={0}
+          name="jitter"
+          onChange={(jitterSeconds) => onChange({ ...draft, jitterSeconds })}
+          value={draft.jitterSeconds}
+        />
+      </div>
+    </section>
+  );
+}
+
+function updateSubreddit(draft: SettingsDraft, index: number, next: SubredditDraft): SettingsDraft {
+  return { ...draft, subreddits: draft.subreddits.map((item, itemIndex) => itemIndex === index ? next : item) };
+}
+
+export function BehaviourSection({ config, draft, errors, onChange }: SectionProps & { config: ConfigResponse }) {
+  return (
+    <section aria-labelledby="behaviour-heading" className="panel settings-section">
+      <div className="panel-heading"><div><span className="eyebrow">Runtime behaviour</span><h2 id="behaviour-heading">Behaviour</h2></div></div>
+      <label className="toggle-field">
+        <input
+          aria-label="Dry run mode"
+          checked={draft.dryRun}
+          onChange={(event) => onChange({ ...draft, dryRun: event.target.checked })}
+          type="checkbox"
+        />
+        <span><strong>Dry run mode</strong><small>Evaluate posts without sending messages.</small></span>
+      </label>
+
+      <div className="subreddit-heading">
+        <div><h3>Subreddits</h3><p>Configure monitored communities and their supported message style.</p></div>
+        <button
+          className="button secondary"
+          onClick={() => onChange({
+            ...draft,
+            subreddits: [
+              ...draft.subreddits,
+              { name: '', type: 'image', weight: '1', tone: 'default', scripted: '' },
+            ],
+          })}
+          type="button"
+        >
+          Add subreddit
+        </button>
+      </div>
+      {errors.subreddits ? <p className="field-error" role="alert">{errors.subreddits}</p> : null}
+      <div className="subreddit-list">
+        {draft.subreddits.map((subreddit, index) => (
+          <fieldset className="subreddit-row" key={index}>
+            <legend>Subreddit {index + 1}</legend>
+            <label className="settings-field">
+              <span>Name</span>
+              <input
+                aria-describedby={errors[`subreddits.${index}.name`] ? `subreddit-${index}-name-error` : undefined}
+                aria-invalid={errors[`subreddits.${index}.name`] ? 'true' : undefined}
+                aria-label={`Subreddit ${index + 1} name`}
+                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, name: event.target.value }))}
+                type="text"
+                value={subreddit.name}
+              />
+              {errors[`subreddits.${index}.name`] ? <small className="field-error" id={`subreddit-${index}-name-error`}>{errors[`subreddits.${index}.name`]}</small> : null}
+            </label>
+            <label className="settings-field">
+              <span>Type</span>
+              <select
+                aria-label={`Subreddit ${index + 1} type`}
+                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, type: event.target.value as SubredditDraft['type'] }))}
+                value={subreddit.type}
+              >
+                <option value="image">Image</option><option value="chat">Chat</option>
+              </select>
+            </label>
+            <label className="settings-field">
+              <span>Weight</span>
+              <input
+                aria-describedby={errors[`subreddits.${index}.weight`] ? `subreddit-${index}-weight-error` : undefined}
+                aria-invalid={errors[`subreddits.${index}.weight`] ? 'true' : undefined}
+                aria-label={`Subreddit ${index + 1} weight`}
+                min="0.01"
+                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, weight: event.target.value }))}
+                step="0.01"
+                type="number"
+                value={subreddit.weight}
+              />
+              {errors[`subreddits.${index}.weight`] ? <small className="field-error" id={`subreddit-${index}-weight-error`}>{errors[`subreddits.${index}.weight`]}</small> : null}
+            </label>
+            <label className="settings-field">
+              <span>Tone</span>
+              <select
+                aria-label={`Subreddit ${index + 1} tone`}
+                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, tone: event.target.value as SubredditDraft['tone'] }))}
+                value={subreddit.tone}
+              >
+                {config.tones.map((tone) => <option key={tone} value={tone}>{tone}</option>)}
+              </select>
+            </label>
+            <label className="settings-field scripted-field">
+              <span>Scripted message (optional)</span>
+              <textarea
+                aria-label={`Subreddit ${index + 1} scripted message`}
+                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, scripted: event.target.value }))}
+                rows={2}
+                value={subreddit.scripted}
+              />
+            </label>
+            <button
+              className="button secondary remove-subreddit"
+              disabled={draft.subreddits.length === 1}
+              onClick={() => onChange({
+                ...draft,
+                subreddits: draft.subreddits.filter((_, itemIndex) => itemIndex !== index),
+              })}
+              type="button"
+            >
+              Remove subreddit {index + 1}
+            </button>
+          </fieldset>
+        ))}
+      </div>
+    </section>
+  );
+}

apps/dashboard/src/features/settings/settings.css

@@ -0,0 +1,48 @@
+.settings-page { max-width: 72rem; }
+.settings-navigation { display: grid; grid-template-columns: 1fr; gap: .5rem; margin-bottom: 1rem; }
+.settings-navigation button { display: grid; gap: .15rem; padding: .8rem; color: var(--muted); text-align: left; background: var(--surface); border: 1px solid var(--border); border-radius: .75rem; }
+.settings-navigation button strong { color: #e9f1ec; }
+.settings-navigation button small { font-size: .72rem; }
+.settings-navigation button.is-active { background: var(--accent-dark); border-color: #28593d; }
+.settings-navigation button:focus-visible, .settings-field input:focus-visible, .settings-field select:focus-visible, .settings-field textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
+.settings-loading { min-height: 24rem; }
+.settings-section { display: grid; gap: 1rem; }
+.settings-copy { color: var(--muted); }
+.settings-grid { display: grid; gap: 1rem; }
+.settings-field { display: grid; gap: .4rem; color: var(--muted); font-size: .8rem; font-weight: 750; }
+.settings-field input, .settings-field select, .settings-field textarea { width: 100%; min-height: 2.7rem; padding: .55rem .7rem; color: #e9f1ec; background: var(--surface-raised); border: 1px solid var(--border); border-radius: .6rem; }
+.settings-field textarea { resize: vertical; }
+.settings-field [aria-invalid="true"] { border-color: var(--danger); }
+.field-error, .save-error { color: var(--danger); }
+.toggle-field { display: flex; align-items: flex-start; gap: .8rem; padding: .9rem; background: var(--surface-raised); border: 1px solid var(--border); border-radius: .75rem; }
+.toggle-field input { width: 1.15rem; height: 1.15rem; margin-top: .15rem; accent-color: var(--accent); }
+.toggle-field span { display: grid; gap: .2rem; }
+.toggle-field small { color: var(--muted); }
+.subreddit-heading { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 1rem; padding-top: .5rem; }
+.subreddit-heading h3 { margin: 0 0 .25rem; }
+.subreddit-heading p { margin: 0; color: var(--muted); }
+.subreddit-list { display: grid; gap: .75rem; }
+.subreddit-row { display: grid; gap: .75rem; min-width: 0; padding: 1rem; border: 1px solid var(--border); border-radius: .75rem; }
+.subreddit-row legend { padding: 0 .4rem; color: var(--accent); font-weight: 800; }
+.remove-subreddit { align-self: end; }
+.settings-save-bar { position: sticky; bottom: 1rem; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; padding: .9rem 1rem; margin-top: 1rem; background: rgba(23, 35, 30, .97); border: 1px solid var(--border); border-radius: .8rem; box-shadow: 0 1rem 3rem rgba(0, 0, 0, .3); }
+.settings-save-bar > div:first-child { display: grid; gap: .15rem; color: var(--muted); }
+.save-success { color: var(--accent); }
+.risk-list { display: grid; gap: .5rem; padding-left: 1.2rem; color: var(--warning); }
+.access-actions { display: flex; flex-wrap: wrap; gap: .75rem; }
+.access-actions a { display: inline-flex; align-items: center; text-decoration: none; }
+.settings-notice { padding: .75rem; border-radius: .65rem; }
+.settings-notice.success { color: #aaf0c4; background: #163a26; }
+.settings-notice.warning { color: #ffe1a0; background: #42351b; }
+.settings-notice.error { color: #ffd1ce; background: #461b18; }
+
+@media (min-width: 42rem) {
+  .settings-navigation { grid-template-columns: repeat(2, minmax(0, 1fr)); }
+  .settings-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
+  .subreddit-row { grid-template-columns: repeat(4, minmax(0, 1fr)); }
+  .scripted-field { grid-column: 1 / -1; }
+}
+
+@media (min-width: 70rem) {
+  .settings-navigation { grid-template-columns: repeat(4, minmax(0, 1fr)); }
+}