docs: add phase 32 plan summaries

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/phases/32-setup-sharing-system/32-04-SUMMARY.md

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+# Plan 32-04 Summary: Shared Setup Viewer
+
+**Status:** Complete
+**Commit:** 0b46eff
+
+## What was done
+
+1. **useSharedSetup hook** (`src/client/hooks/useSetups.ts`):
+   - Fetches `/api/shared/:token` with retry disabled (404 = invalid token)
+   - Returns same SetupWithItems type as other setup hooks
+
+2. **Route search params** (`src/client/routes/setups/$setupId.tsx`):
+   - Added `validateSearch` with Zod schema for `share` query param
+   - Three-way data source: share token > authenticated owner > public viewer
+
+3. **Shared setup banner**:
+   - Blue banner with link icon: "Shared setup" shown when share token present
+   - Positioned above the sticky header bar
+
+4. **Error state for invalid tokens**:
+   - Shows "Link not available" with link icon and descriptive text
+   - Renders instead of the normal page when shared fetch errors
+
+5. **Read-only mode**:
+   - `showOwnerControls` computed from `!isSharedView && isAuthenticated`
+   - Hidden in shared view: Add Items, Share button, Delete Setup, item removal, classification cycling
+   - Item Picker, Share Modal, and Delete Dialog all gated behind `showOwnerControls`
+
+## Verification
+
+- `bun run lint`: Our files pass (pre-existing errors in unrelated files only)
+- Share token detection and three-way data source logic correct
+- All owner controls properly hidden in shared view