docs(31): add code review report

.planning/phases/31-mobile-polish/31-REVIEW.md

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+---
+phase: 31
+slug: mobile-polish
+status: clean
+depth: standard
+files_reviewed: 4
+findings:
+  critical: 0
+  warning: 0
+  info: 0
+  total: 0
+reviewed: 2026-04-12
+---
+
+# Phase 31: Mobile Polish — Code Review
+
+## Scope
+
+| File | Lines Changed | Status |
+|------|--------------|--------|
+| src/client/routes/items/$itemId.tsx | +35 / -3 | Clean |
+| src/client/routes/threads/$threadId/candidates/$candidateId.tsx | +45 / -10 | Clean |
+| src/client/routes/setups/$setupId.tsx | +42 / -28 | Clean |
+| src/client/routes/global-items/$globalItemId.tsx | +37 / -2 | Clean |
+
+## Summary
+
+No issues found. All 4 files pass review at standard depth.
+
+### Patterns Verified
+
+- **Consistent breakpoint usage:** All files use `md:` (768px) matching BottomTabBar and TopNav
+- **Accessibility:** Every icon-only button has `aria-label` and `title` attributes
+- **Touch targets:** All mobile buttons have `min-w-[44px] min-h-[44px]`
+- **No handler duplication bugs:** onClick handlers on paired buttons are identical (same function references)
+- **No stale imports:** LucideIcon was already imported in itemId.tsx, candidateId.tsx, setupId.tsx; correctly added to globalItemId.tsx
+- **Inline SVG cleanup:** Setup page inline SVGs fully replaced with LucideIcon (plus, globe)
+- **Edit mode isolation:** Cancel/Save buttons in edit mode are untouched across all files
+- **Conditional rendering preserved:** isEditing, isActive, isAuthenticated guards unchanged
+
+## Findings
+
+None.