# v0.2.0 Player Mode — Implementation Summary

## Task Description

Implemented all 9 tasks from the v0.2.0 Player Mode implementation plan using subagent-driven development (SDD). This is the execution phase following the design spec and plan created in an earlier session.

## Changes Made

### 11 commits (bd96da4..7e838dc)

| Commit | Description |
|--------|-------------|
| `bd96da4` | Task 1: `appMode` preference (clipper/player) with persistence |
| `d9f5874` | Task 2: PiP, fullscreen, playbackRate helpers in playback module |
| `bb5fa4b` | Task 3: SpeedSelector popup component |
| `f717687` | Task 4: PlayerControls floating overlay (frosted glass, seek bar, all controls) |
| `56686a3` | Task 5: PlayerTimeline simplified waveform component |
| `d36138c` | Task 6: Player/Clipper mode switching with auto-hide UI in App.svelte |
| `199ad1c` | Task 6 fix: transport shortcuts fallback via `runTransportAction` for Player mode |
| `3e219b7` | Task 7: Conditional CC rendering, click-to-play, bindable captionsEnabled |
| `2472dec` | Task 7 fix: bind captionsEnabled between App and VideoPlayer |
| `1a86a34` | Task 8: FLIP transitions (fly/fade + CSS grid transition) |
| `7e838dc` | Task 9: Version bump 0.1.3 → 0.2.0 |

### Files (17 changed, +1327 −92)

**New files:**
- `src/lib/components/PlayerControls.svelte` — floating overlay with seek bar, play/pause, skip, volume, speed, CC, PiP, fullscreen
- `src/lib/components/PlayerTimeline.svelte` — simplified waveform-only timeline
- `src/lib/components/SpeedSelector.svelte` — playback speed popup (0.5x–2x)
- `tests/lib/components/SpeedSelector.test.ts` — 3 component tests
- `tests/lib/stores/preferences.test.ts` — 3 preference tests
- `tests/lib/transport/playback.test.ts` — 10 playback helper tests

**Modified files:**
- `src/App.svelte` — mode switching, auto-hide, keyboard shortcuts, layout conditionals
- `src/app.css` — grid transitions, player-mode positioning
- `src/lib/components/VideoPlayer.svelte` — bindable captionsEnabled, click-to-play, conditional CC
- `src/lib/stores/preferences.svelte.ts` — appMode field + persistence
- `src/lib/transport/playback.ts` — PiP, fullscreen, playbackRate exports
- `vite.config.ts` — svelteTesting() plugin for Svelte 5 component tests

## Key Architecture Decisions

1. **Single always-mounted VideoPlayer** — video element stays in DOM across mode switches, avoiding destruction/recreation
2. **Proximity-based auto-hide** — controls: any mouse move + 3s timeout; toolbar: 50px from top; timeline: 80px from bottom
3. **Transport fallback** — `dispatchTransport()` falls back to `runTransportAction()` when TransportControls is null (Player mode)
4. **CSS Grid transitions** — `.content` animates grid-template changes for smooth layout shifts
5. **Polling for PiP/fullscreen state** — PlayerControls polls `isPiPActive()`/`isFullscreenActive()` at 500ms

## Bugs Found & Fixed

1. **Transport shortcuts no-op in Player mode** — TransportControls not rendered → `transportControls` null → all playback shortcuts broken. Fixed with `runTransportAction` fallback.
2. **captionsEnabled not bound** — App.svelte and VideoPlayer had separate `captionsEnabled` states. Fixed with `bind:captionsEnabled`.

## Lessons Learned

- When a component that handles keyboard dispatch is conditionally rendered, always provide a fallback path for the keyboard handler
- Svelte 5 bindable props require explicit `$bindable()` wrapper and typed `$props()` destructuring
- Svelte 5 component testing in vitest/jsdom needs `svelteTesting()` plugin in vite config (not documented in the plan)
- Timer-based click/double-click discrimination (250ms delay) is the standard pattern for video players

## Test Results

- **8 test files, 47 tests passing**
- **svelte-check: 0 errors** (1 pre-existing a11y warning — missing tabindex on slider role)

## Follow-up Items

- Add `tabindex="0"` to PlayerControls seek bar slider role (a11y warning)
- Remove dead `handleVideoClick()` function in VideoPlayer.svelte (unused, superseded by `handleVideoClickWithDelay`)
- Consider event-based PiP/fullscreen state updates instead of 500ms polling
- Visual QA with `npm run tauri dev` for transition smoothness