refactor(swipe): split swipe screen modules

Move swipe screen logic into hooks/services and extract
state-specific UI components to keep files small while
preserving existing behavior.

Reference: US-002

.ralph/guardrails.md

@@ -0,0 +1,20 @@
+# Guardrails (Signs)
+
+> Lessons learned from failures. Read before acting.
+
+## Core Signs
+
+### Sign: Read Before Writing
+- **Trigger**: Before modifying any file
+- **Instruction**: Read the file first
+- **Added after**: Core principle
+
+### Sign: Test Before Commit
+- **Trigger**: Before committing changes
+- **Instruction**: Run required tests and verify outputs
+- **Added after**: Core principle
+
+---
+
+## Learned Signs
+