# Milestone v1.6: Media Features Polish

**Status:** ✅ SHIPPED 2026-03-03
**Phases:** 26-27
**Total Plans:** 5

## Overview

v1.6 addressed usability issues in JamTrack (loading sequence bug, sizing, navigation) and Backing Track (sync integration). Metronome responsiveness was determined to be satisfactory after phases 26-27 improvements and was descoped.

## Phases

### Phase 26: JamTrack Polish
**Goal**: JamTrack player works correctly from selection through playback without freezes
**Depends on**: v1.5 complete
**Requirements**: JT-01, JT-02, JT-03, JT-04
**Success Criteria** (what must be TRUE):
  1. User sees loading indicator while backend processes track (not premature stem UI)
  2. JamTrack player fits properly in popup window without scrollbars
  3. "Create custom mix" button opens JamTrack editor in new tab
  4. No console warnings about leaked callbacks when closing JamTrack or navigating away
**Plans**: 4 plans

Plans:
- [x] 26-01-PLAN.md - Fix window sizing and create custom mix navigation ✓
- [x] 26-02-PLAN.md - Add callback cleanup and defer controls rendering ✓
- [x] 26-03-PLAN.md - Remove 'idle' from valid render states (gap closure) ✓
- [x] 26-04-PLAN.md - Trigger loadJamTrack when not synchronized (gap closure) ✓

**Completed:** 2026-02-25

### Phase 27: Backing Track Sync
**Goal**: Backing Track appears in session screen when opened
**Depends on**: Nothing (independent of Phase 26)
**Requirements**: BT-01, BT-02
**Success Criteria** (what must be TRUE):
  1. Opening a backing track file shows the track in session screen (not just popup)
  2. No "state update on unmounted component" warnings when closing backing track quickly
**Plans**: 1 plan

Plans:
- [x] 27-01-PLAN.md - Use openBackingTrack action and add async cleanup ✓

**Completed:** 2026-02-26

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## Milestone Summary

**Descoped Phases:**
- Phase 28: Metronome Responsiveness — descoped as responsiveness was satisfactory after Phase 26-27 improvements

**Key Decisions:**
- Keep WindowPortal for Metronome (consistency with JamTrack, BackingTrack, Chat)
- 300ms debounce for responsive UI while avoiding excessive native client calls
- WindowPortal sizing should match content dimensions plus padding (420px + 40px = 460px)
- Use noopener,noreferrer for security on window.open calls
- cleanupJamTrackCallbacks is a simple function (not thunk) since it only manipulates window globals
- Controls render when downloadState is 'synchronized' only (removed 'idle' from conditions)
- Call checkJamTrackSync BEFORE dispatching setSelectedJamTrack/setJamTrackStems
- Call loadJamTrack when syncResult.isSynchronized is false to trigger download flow
- Use openBackingTrack action instead of direct jamClient call for centralized sync
- Use ignore flag pattern (not AbortController) for simple async cleanup

**Issues Resolved:**
- JamTrack player showed empty controls before backend processing complete
- JamTrack player window had scrollbars due to incorrect sizing
- "Create custom mix" button did nothing
- Memory leaks from unreleased JamTrack callbacks
- Backing track didn't appear in session screen (only popup)
- State update warnings when closing backing track quickly

**Issues Deferred:**
- Metronome debounce (MET-01, MET-02) — responsiveness satisfactory

**Technical Debt Incurred:**
- None identified

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*For current project status, see .planning/ROADMAP.md*
*Archived: 2026-03-03*
