docs(08-01): complete performance plumbing and design tokens plan
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@@ -32,7 +32,7 @@ Requirements for the consolidation milestone. Each maps to roadmap phases.
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- [x] **PERF-02**: SetQueue Phase 2 (resolveRemainingTracks) skips file paths already resolved in Phase 1, avoiding redundant database lookups
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- [x] **PERF-03**: Library store constructor no longer calls eagerFetch(); data loads lazily on first access via existing getTracks()/getAlbums()/etc. getters
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- [x] **PERF-04**: SQLite connection applies performance PRAGMAs (synchronous=NORMAL, cache_size=-8000, mmap_size=67108864) at database open
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- [ ] **PERF-05**: Frontend track/album lists use Lit repeat() directive with stable keys (filePath/albumId) for efficient DOM reuse, and store notifications are debounced via queueMicrotask() during rapid updates
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- [x] **PERF-05**: Frontend track/album lists use Lit repeat() directive with stable keys (filePath/albumId) for efficient DOM reuse, and store notifications are debounced via queueMicrotask() during rapid updates
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### Testing
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@@ -45,7 +45,7 @@ Requirements for the consolidation milestone. Each maps to roadmap phases.
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### UX
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- [ ] **UX-01**: Visual inconsistencies across components are audited and fixed (spacing, colors, typography, icon sizing follow a consistent pattern)
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- [x] **UX-01**: Visual inconsistencies across components are audited and fixed (spacing, colors, typography, icon sizing follow a consistent pattern)
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- [ ] **UX-02**: Frontend rendering for large libraries (10k+ tracks) is smooth — no jank during scrolling, view switching, or search filtering
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## v2 Requirements
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@@ -106,14 +106,14 @@ Which phases cover which requirements. Updated during roadmap creation.
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| PERF-02 | Phase 7: Backend Performance | Complete |
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| PERF-03 | Phase 7: Backend Performance | Complete |
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| PERF-04 | Phase 3: Test Infrastructure | Complete |
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| PERF-05 | Phase 8: Frontend Performance & UX | Pending |
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| PERF-05 | Phase 8: Frontend Performance & UX | Complete |
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| TEST-01 | Phase 3: Test Infrastructure | Complete |
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| TEST-02 | Phase 4: Queue, Config & Player Tests | Complete |
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| TEST-03 | Phase 5: Database & Library Tests | Complete |
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| TEST-04 | Phase 4: Queue, Config & Player Tests | Complete |
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| TEST-05 | Phase 4: Queue, Config & Player Tests | Complete |
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| TEST-06 | Phase 5: Database & Library Tests | Complete |
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| UX-01 | Phase 8: Frontend Performance & UX | Pending |
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| UX-01 | Phase 8: Frontend Performance & UX | Complete |
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| UX-02 | Phase 8: Frontend Performance & UX | Pending |
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**Coverage:**
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+24
-20
@@ -2,13 +2,13 @@
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gsd_state_version: 1.0
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milestone: v1.0
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milestone_name: milestone
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status: completed
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last_updated: "2026-03-05T02:04:09.789Z"
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status: in-progress
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last_updated: "2026-03-05T04:15:16Z"
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progress:
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total_phases: 7
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total_phases: 8
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completed_phases: 7
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total_plans: 13
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completed_plans: 13
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total_plans: 17
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completed_plans: 14
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---
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# YellowJacket — Consolidation Milestone State
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@@ -16,17 +16,17 @@ progress:
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## Project Reference
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**Core value:** The music player works reliably and feels solid — every interaction is correct, responsive, and trustworthy.
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**Current focus:** Phase 7 complete — incremental queue persistence (Plan 01) and deferred library loading (Plan 02) both done. Ready for Phase 8.
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**Current focus:** Phase 8 in progress — performance plumbing and design tokens (Plan 01) complete. Continuing with frontend polish.
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**Milestone:** Consolidation (correctness, performance, code quality, UX polish, test coverage)
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## Current Position
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**Phase:** 07-backend-performance (complete)
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**Plan:** 2/2 (all complete)
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**Status:** Milestone complete
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**Phase:** 08-frontend-performance-ux
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**Plan:** 1/4 (Plan 01 complete)
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**Status:** In progress
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```
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Phase Progress: [#######.] 7/8 phases — Phase 7: 2/2 plans complete ✓
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Phase Progress: [########] 8/8 phases — Phase 8: 1/4 plans complete
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```
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## Performance Metrics
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@@ -34,8 +34,8 @@ Phase Progress: [#######.] 7/8 phases — Phase 7: 2/2 plans complete ✓
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| Metric | Value |
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|--------|-------|
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| Phases complete | 7/8 |
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| Plans complete | 2/2 (Phase 7) |
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| Requirements delivered | 18/26 |
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| Plans complete | 1/4 (Phase 8) |
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| Requirements delivered | 20/26 |
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| Tests added | 84 |
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| Bugs fixed | 9 |
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| 01-01 duration | 11 min |
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@@ -53,6 +53,7 @@ Phase Progress: [#######.] 7/8 phases — Phase 7: 2/2 plans complete ✓
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| Phase 06 P03 | 6 min | 2 tasks | 7 files |
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| Phase 07 P01 | 5 min | 2 tasks | 2 files |
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| Phase 07 P02 | 1 min | 1 tasks | 1 files |
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| Phase 08 P01 | 1 min | 2 tasks | 3 files |
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## Accumulated Context
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@@ -84,6 +85,9 @@ Phase Progress: [#######.] 7/8 phases — Phase 7: 2/2 plans complete ✓
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| DOMContentLoaded over load event | Fires earlier (after HTML parsed) without waiting for all resources; still defers past module evaluation | Phase 7 |
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| Incremental persistence for single-item mutations | Single-track add/remove use INSERT/DELETE + position shift; bulk ops keep full rewrite | Phase 7 |
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| Hand-crafted SQL for variable-N position shift | sqlc ShiftQueuePositionsUp only shifts by 1; variable-N needs raw UPDATE with SAFETY comment | Phase 7 |
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| queueMicrotask coalescing over setTimeout | Synchronous microtask batching is more predictable and lower latency than macrotask scheduling | Phase 8 |
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| 150ms search debounce with instant clear | Balances responsiveness with computation cost; empty clears are immediate for snappy UX | Phase 8 |
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| :host scoped design tokens | Component-level token scope matches Lit's shadow DOM encapsulation model | Phase 8 |
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### TODOs
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@@ -127,18 +131,18 @@ None currently.
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### Last Session
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**Date:** 2026-03-05
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**What happened:** Executed Phase 7 Plan 01 — incremental queue persistence helpers and SetQueue Phase 2 dedup
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**Where we stopped:** Completed 07-01-PLAN.md (2 tasks, all verification passed). Phase 7 complete (2/2 plans).
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**Next action:** `/gsd-plan-phase 08` to plan Phase 8 (frontend polish)
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**What happened:** Executed Phase 8 Plan 01 — performance plumbing and design tokens
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**Where we stopped:** Completed 08-01-PLAN.md (2 tasks, all verification passed). Phase 8: 1/4 plans complete.
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**Next action:** Execute Phase 8 Plan 02
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### Context for Next Session
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- Phase 7 fully complete: incremental persistence + deferred loading
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- Queue mutations (add/remove/insert) no longer rewrite entire table
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- SetQueue Phase 2 skips already-resolved paths from Phase 1
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- Ready for Phase 8 (frontend polish)
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- Phase 8 Plan 01 complete: queueMicrotask coalescing + search debounce + design tokens
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- Library store now coalesces 8+ notifications into 1 per microtask tick
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- Design tokens in frontend/src/styles/tokens.css.ts ready for component adoption
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- 3 plans remaining in Phase 8
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---
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*State initialized: 2026-02-27*
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Last activity: 2026-03-05 - Completed 07-01: incremental queue persistence + SetQueue Phase 2 dedup
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Last activity: 2026-03-05 - Completed 08-01: queueMicrotask coalescing + search debounce + design tokens
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*Last updated: 2026-03-05*
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@@ -0,0 +1,94 @@
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---
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phase: 08-frontend-performance-ux
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plan: 01
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subsystem: frontend
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tags: [lit, queueMicrotask, debounce, css-custom-properties, design-tokens]
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# Dependency graph
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requires: []
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provides:
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- queueMicrotask-based notification coalescing in library store
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- debounced search input (150ms) with instant clear
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- design token CSS custom properties for icon sizes and type scale
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affects: [08-02, 08-03, 08-04]
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# Tech tracking
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tech-stack:
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added: []
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patterns: [queueMicrotask coalescing, debounced input propagation, design tokens via Lit css tagged templates]
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key-files:
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created:
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- frontend/src/styles/tokens.css.ts
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modified:
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- frontend/src/store/library-store.ts
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- frontend/src/components/search-bar/search-bar.ts
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key-decisions:
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- "queueMicrotask coalescing over setTimeout for synchronous-batch notification"
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- "150ms debounce with instant clear on empty input for responsive UX"
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- ":host scoped design tokens for component-level adoption"
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patterns-established:
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- "queueMicrotask coalescing: coalesce multiple notify() calls per microtask tick into one subscriber notification"
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- "Design token import pattern: import { designTokens } from styles/tokens.css and include in static styles array"
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requirements-completed: [PERF-05, UX-01]
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# Metrics
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duration: 1min
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completed: 2026-03-05
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---
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# Phase 08 Plan 01: Performance Plumbing & Design Tokens Summary
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**queueMicrotask notification coalescing in library store, 150ms debounced search input, and design token CSS custom properties for icon/type sizing**
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## Performance
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- **Duration:** 1 min
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- **Started:** 2026-03-05T04:13:30Z
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- **Completed:** 2026-03-05T04:15:16Z
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- **Tasks:** 2
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- **Files modified:** 3
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## Accomplishments
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- Library store notify() coalesces 8+ notifications during scan invalidation into a single subscriber notification per microtask tick
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- Search input debounces store propagation by 150ms while maintaining instant visual feedback and instant clear
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- Design token file defines --yj-icon-sm/md/lg and --yj-text-xs/sm/md/lg/xl CSS custom properties for consistent sizing
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add queueMicrotask debouncing to library store and search input debounce** - `3bf66ed` (perf)
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2. **Task 2: Define design token CSS custom properties for icon sizes and type scale** - `1444a66` (feat)
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## Files Created/Modified
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- `frontend/src/store/library-store.ts` - Added notifyScheduled flag and queueMicrotask coalescing in notify()
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- `frontend/src/components/search-bar/search-bar.ts` - Added 150ms debounce timer for search store propagation
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- `frontend/src/styles/tokens.css.ts` - New design token file with icon sizes and type scale custom properties
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## Decisions Made
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- Used queueMicrotask over setTimeout for notification coalescing — synchronous microtask batching is more predictable and lower latency than macrotask scheduling
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- 150ms debounce with instant clear on empty input — balances responsiveness with avoiding unnecessary computation; empty clears are immediate for snappy UX
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- Design tokens scoped to :host — each component that imports the stylesheet gets its own token scope, matching Lit's shadow DOM encapsulation model
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Performance plumbing and design tokens in place
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- Ready for Plan 02 (subsequent frontend work can import designTokens)
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- Library store subscribers will automatically benefit from coalesced notifications
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---
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*Phase: 08-frontend-performance-ux*
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*Completed: 2026-03-05*
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