docs(quick-002): complete auto-rename duplicate playlists on import summary

- Add 002-SUMMARY.md with task details and verification results
- Update STATE.md quick tasks table

.planning/STATE.md

@@ -78,6 +78,7 @@ None currently.
 | # | Description | Date | Commit | Directory |
 |---|-------------|------|--------|-----------|
 | 001 | Multi-playlist import support | 2026-02-28 | 50c8a33 | [001-multi-playlist-import-support](./quick/001-multi-playlist-import-support/) |
+| 002 | Auto-rename duplicate playlists on import | 2026-02-28 | 8ba8bbe | [002-auto-rename-duplicate-playlists-on-import](./quick/002-auto-rename-duplicate-playlists-on-import/) |
 
 ## Session Continuity
 
@@ -97,5 +98,5 @@ None currently.
 
 ---
 *State initialized: 2026-02-27*
-Last activity: 2026-02-28 - Completed quick task 001: Multi-playlist import support
+Last activity: 2026-02-28 - Completed quick task 002: Auto-rename duplicate playlists on import
 *Last updated: 2026-02-28*

.planning/quick/002-auto-rename-duplicate-playlists-on-import/002-SUMMARY.md

@@ -0,0 +1,65 @@
+---
+phase: quick
+plan: 002
+subsystem: playlist-import
+tags: [playlist, import, deduplication, sqlc]
+dependency_graph:
+  requires: []
+  provides: [unique-playlist-names-on-import]
+  affects: [playlist-import-flow]
+tech_stack:
+  added: []
+  patterns: [count-query-for-uniqueness, sequential-rename-suffix]
+key_files:
+  created: []
+  modified:
+    - backend/database/sql/queries/playlists.sql
+    - backend/database/sql/sqlcgen/playlists.sql.go
+    - backend/playlist/playlist.go
+decisions:
+  - Placed CountPlaylistsByName query between playlist CRUD and track queries for logical grouping
+  - uniquePlaylistName is a private method — only ImportPlaylist calls it, keeping CreatePlaylist/CreatePlaylistWithTracks unchanged
+metrics:
+  duration: 10 min
+  completed: "2026-02-28"
+---
+
+# Quick Task 002: Auto-rename Duplicate Playlists on Import Summary
+
+**One-liner:** CountPlaylistsByName query + uniquePlaylistName helper auto-appends (1), (2), etc. on M3U import when name collides
+
+## What Was Done
+
+### Task 1: Add CountPlaylistsByName SQL query and regenerate sqlc
+- Added `CountPlaylistsByName :one` query to `playlists.sql` — counts playlists with exact name match
+- Regenerated sqlc producing `CountPlaylistsByName(ctx, name) (int64, error)` in Go
+- **Commit:** `04b2088`
+
+### Task 2: Add uniquePlaylistName helper and wire into ImportPlaylist
+- Added `uniquePlaylistName(name string) string` method to playlist Service
+- Logic: if name exists, tries "Name (1)", "Name (2)", etc. until a free name is found
+- Wired single call `playlistName = s.uniquePlaylistName(playlistName)` in ImportPlaylist, between name derivation and CreatePlaylist call
+- CreatePlaylist and CreatePlaylistWithTracks remain unchanged — no auto-rename on manual creation
+- **Commit:** `8ba8bbe`
+
+## Verification Results
+
+| Check | Result |
+|-------|--------|
+| `go build ./backend/...` | ✅ Pass |
+| `go vet ./backend/...` | ✅ Pass |
+| CountPlaylistsByName in generated Go | ✅ Present |
+| uniquePlaylistName only in ImportPlaylist | ✅ 3 occurrences (comment, definition, one call site) |
+| CreatePlaylist unchanged | ✅ No uniquePlaylistName reference |
+| CreatePlaylistWithTracks unchanged | ✅ No uniquePlaylistName reference |
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+## Commits
+
+| # | Hash | Message |
+|---|------|---------|
+| 1 | `04b2088` | feat(quick-002): add CountPlaylistsByName SQL query and regenerate sqlc |
+| 2 | `8ba8bbe` | feat(quick-002): add uniquePlaylistName helper and wire into ImportPlaylist |