feat: dashboard UI/UX overhaul from full review

Shared foundation:
- New Modal component on native <dialog>.showModal() (focus trap, inert
  background, Escape, focus restore, scroll lock); all eight dialogs and
  both globalThis.confirm calls migrated to it
- Design tokens for success/warning/danger surfaces; pill danger variant;
  .sr-only utility; toast layering above dialog backdrops; not-allowed
  cursor for validity-disabled buttons

Conversations/attention: auto-scroll with jump-to-latest, per-conversation
draft persistence, suggestion undo, 30s auto-refresh with refresh controls,
unread emphasis and counts, blur-consistent share dialog, empty-accounts
guidance, collapsed user lookup, relative timestamps, danger pills for
critical items

Media/library/outreach: click-blurred-to-reveal, lightbox with arrow
navigation and captions, dirty-form preservation across refetches, upload
validation with thumbnail preview, save feedback, result counts with
load-more and clear-filters, ticking countdowns from a single clock

Overview/performance/operations/settings: mutation errors inside the
confirm dialog, live sending-window countdown, offline-aware loading
states, per-panel loading/error with retry, 7/30/90-day range toggle,
console scroll yielding with shown/retained counts, risky-save matching
by subreddit name instead of index, useBlocker unsaved-changes guard,
single-pass validation with focus-to-first-error, access panel JSON
validation and input reset

Tests: 806 -> 844 passing; both typechecks clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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

@@ -1,8 +1,8 @@
-import { useMemo, useState } from 'react';
-import { filterMedia, mediaConversation, type MediaFilters } from './filters.js';
+import { useEffect, useMemo, useState } from 'react';
+import { filterMedia, mediaAlt, mediaConversation, type MediaFilters } from './filters.js';
 import { FullSyncDialog } from './full-sync-dialog.js';
 import { MediaCard } from './media-card.js';
-import { MediaPreviewDialog } from './media-preview-dialog.js';
+import { MediaPreviewDialog, type MediaPreviewEntry } from './media-preview-dialog.js';
 import { useMediaQuery, useMediaSyncStatusQuery, useTriggerMediaSyncMutation } from './queries.js';
 import './media.css';
 
@@ -13,6 +13,9 @@ export const initialMediaFilters: MediaFilters = {
   dateRange: 'all',
 };
 
+const PAGE_SIZE = 48;
+const SUCCESS_NOTICE_MS = 5_000;
+
 function errorMessage(error: Error | null): string {
   return error?.message ?? 'Something went wrong.';
 }
@@ -36,9 +39,11 @@ export function MediaPage({ filters: controlledFilters, onFiltersChange }: Media
   const [isRevealAll, setIsRevealAll] = useState(false);
   const [isFullSyncDialogOpen, setIsFullSyncDialogOpen] = useState(false);
   const [previewItemId, setPreviewItemId] = useState<string | null>(null);
+  const [visibleLimit, setVisibleLimit] = useState(PAGE_SIZE);
 
   const items = mediaQuery.data ?? [];
   const visibleItems = useMemo(() => filterMedia(items, filters, Date.now()), [items, filters]);
+  const displayedItems = visibleItems.slice(0, visibleLimit);
   const conversations = useMemo(
     () => [...new Set(items.map(mediaConversation))].sort((left, right) => left.localeCompare(right)),
     [items],
@@ -48,12 +53,37 @@ export function MediaPage({ filters: controlledFilters, onFiltersChange }: Media
     [items],
   );
   const isSyncBusy = statusQuery.data?.isSyncing === true || syncMutation.isPending;
-  const previewItem = items.find((item) => item.id === previewItemId) ?? null;
+  const isFiltered = filters.conversation !== 'all' || filters.sender !== 'all' || filters.type !== 'all' || filters.dateRange !== 'all';
+  const previewIndex = previewItemId === null ? -1 : visibleItems.findIndex((item) => item.id === previewItemId);
+  const previewEntries: MediaPreviewEntry[] = useMemo(
+    () => visibleItems.map((item) => ({
+      id: item.id,
+      src: item.urlPath,
+      alt: mediaAlt(item),
+      label: `Media from ${item.sender}`,
+      captionTitle: `u/${item.sender}`,
+      captionSubtitle: formatLastSync(item.timestamp),
+    })),
+    [visibleItems],
+  );
 
-  function updateFilter<Key extends keyof MediaFilters>(key: Key, value: MediaFilters[Key]) {
-    const next = { ...filters, [key]: value };
+  const isSyncSuccess = syncMutation.isSuccess;
+  useEffect(() => {
+    if (!isSyncSuccess) return;
+    const timer = setTimeout(() => syncMutation.reset(), SUCCESS_NOTICE_MS);
+    return () => clearTimeout(timer);
+    // syncMutation is a fresh object every render; keying on isSuccess is intentional.
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [isSyncSuccess]);
+
+  function updateFilters(next: MediaFilters) {
     if (controlledFilters === undefined) setLocalFilters(next);
     onFiltersChange?.(next);
+    setVisibleLimit(PAGE_SIZE);
+  }
+
+  function updateFilter<Key extends keyof MediaFilters>(key: Key, value: MediaFilters[Key]) {
+    updateFilters({ ...filters, [key]: value });
   }
 
   function toggleItem(itemId: string) {
@@ -90,7 +120,15 @@ export function MediaPage({ filters: controlledFilters, onFiltersChange }: Media
       <div className="page-state error-state" role="alert">
         <strong>Media unavailable</strong>
         <span>{errorMessage(mediaQuery.error)}</span>
-        <button className="button secondary" onClick={() => void mediaQuery.refetch()} type="button">Retry media</button>
+        <button
+          aria-busy={mediaQuery.isFetching || undefined}
+          className="button secondary"
+          disabled={mediaQuery.isFetching}
+          onClick={() => void mediaQuery.refetch()}
+          type="button"
+        >
+          {mediaQuery.isFetching ? 'Refreshing…' : 'Retry media'}
+        </button>
       </div>
     );
   }
@@ -106,11 +144,9 @@ export function MediaPage({ filters: controlledFilters, onFiltersChange }: Media
         <div className="header-actions">
           {items.length > 0 ? (
             <button
+              aria-pressed={isRevealAll}
               className="button secondary"
-              onClick={() => {
-                setIsRevealAll((current) => !current);
-                setRevealedIds(new Set());
-              }}
+              onClick={() => setIsRevealAll((current) => !current)}
               type="button"
             >
               {isRevealAll ? 'Blur all media' : 'Reveal all media'}
@@ -127,7 +163,7 @@ export function MediaPage({ filters: controlledFilters, onFiltersChange }: Media
           >
             Full sync
           </button>
-          <button className="button primary" disabled={isSyncBusy} onClick={() => runSync(false)} type="button">
+          <button aria-busy={isSyncBusy || undefined} className="button primary" disabled={isSyncBusy} onClick={() => runSync(false)} type="button">
             {isSyncBusy ? 'Syncing…' : 'Sync new media'}
           </button>
         </div>
@@ -138,7 +174,15 @@ export function MediaPage({ filters: controlledFilters, onFiltersChange }: Media
         {statusQuery.isError ? (
           <div role="alert">
             <span>{errorMessage(statusQuery.error)}</span>
-            <button className="button secondary" onClick={() => void statusQuery.refetch()} type="button">Retry sync status</button>
+            <button
+              aria-busy={statusQuery.isFetching || undefined}
+              className="button secondary"
+              disabled={statusQuery.isFetching}
+              onClick={() => void statusQuery.refetch()}
+              type="button"
+            >
+              {statusQuery.isFetching ? 'Refreshing…' : 'Retry sync status'}
+            </button>
           </div>
         ) : null}
         {statusQuery.data ? (
@@ -188,22 +232,45 @@ export function MediaPage({ filters: controlledFilters, onFiltersChange }: Media
                 <option value="all">Any time</option><option value="24h">Past 24 hours</option><option value="7d">Past 7 days</option><option value="30d">Past 30 days</option>
               </select>
             </label>
+            <div className="media-filter-summary">
+              <span role="status">Showing {displayedItems.length} of {items.length} items</span>
+              {isFiltered ? (
+                <button className="button secondary" onClick={() => updateFilters(initialMediaFilters)} type="button">
+                  Clear filters
+                </button>
+              ) : null}
+            </div>
           </section>
 
           {visibleItems.length === 0 ? (
-            <section className="panel empty-state"><strong>No media matches these filters.</strong><span>Try broadening one or more filters.</span></section>
-          ) : (
-            <section aria-label="Media gallery" className="media-grid">
-              {visibleItems.map((item) => (
-                <MediaCard
-                  isRevealed={isRevealAll || revealedIds.has(item.id)}
-                  item={item}
-                  key={item.id}
-                  onOpenPreview={() => setPreviewItemId(item.id)}
-                  onToggleReveal={() => toggleItem(item.id)}
-                />
-              ))}
+            <section className="panel empty-state">
+              <strong>No media matches these filters.</strong>
+              <span>Try broadening one or more filters.</span>
+              <button className="button secondary" onClick={() => updateFilters(initialMediaFilters)} type="button">
+                Clear filters
+              </button>
             </section>
+          ) : (
+            <>
+              <section aria-label="Media gallery" className="media-grid">
+                {displayedItems.map((item) => (
+                  <MediaCard
+                    isRevealed={isRevealAll || revealedIds.has(item.id)}
+                    item={item}
+                    key={item.id}
+                    onOpenPreview={() => setPreviewItemId(item.id)}
+                    onToggleReveal={() => toggleItem(item.id)}
+                  />
+                ))}
+              </section>
+              {visibleItems.length > displayedItems.length ? (
+                <div className="media-load-more">
+                  <button className="button secondary" onClick={() => setVisibleLimit((current) => current + PAGE_SIZE)} type="button">
+                    Load more ({visibleItems.length - displayedItems.length} remaining)
+                  </button>
+                </div>
+              ) : null}
+            </>
           )}
         </>
       )}
@@ -215,7 +282,14 @@ export function MediaPage({ filters: controlledFilters, onFiltersChange }: Media
           onConfirm={() => runSync(true)}
         />
       ) : null}
-      {previewItem ? <MediaPreviewDialog item={previewItem} onClose={() => setPreviewItemId(null)} /> : null}
+      {previewIndex >= 0 ? (
+        <MediaPreviewDialog
+          entries={previewEntries}
+          index={previewIndex}
+          onClose={() => setPreviewItemId(null)}
+          onNavigate={(nextIndex) => setPreviewItemId(visibleItems[nextIndex]?.id ?? null)}
+        />
+      ) : null}
     </div>
   );
 }