test(26): complete UAT - 3 passed, 1 issue

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/phases/26-jamtrack-polish/26-UAT.md

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+---
+status: complete
+phase: 26-jamtrack-polish
+source: [26-01-SUMMARY.md, 26-02-SUMMARY.md]
+started: 2026-02-25T13:50:00Z
+updated: 2026-02-25T14:00:00Z
+---
+
+## Current Test
+
+[testing complete]
+
+## Tests
+
+### 1. JamTrack popup window sizing
+expected: Open a JamTrack in the session screen. The popup window should fit the player content without scrollbars. Window dimensions should be approximately 460x350 pixels.
+result: pass
+notes: User manually adjusted dimensions to look good
+
+### 2. Create custom mix navigation
+expected: In the JamTrack player, click the "create custom mix" link. A new browser tab should open with the JamTrack editor at /jamtracks/{id}.
+result: pass
+
+### 3. Controls deferred until track ready
+expected: Select a JamTrack that needs downloading. You should see loading/download progress first, and the playback controls (play/stop/seek) should only appear AFTER the track is synchronized.
+result: issue
+reported: "Not only I see the playback controls before the JamTrack been processed in the server, but I also see the tracks (stems) of that JamTrack been shown in the Session Screen. This is wrong."
+severity: major
+
+### 4. No console warnings on close
+expected: Open a JamTrack player, then close the popup window. Check browser developer console - there should be no warnings about leaked callbacks or "state update on unmounted component".
+result: pass
+
+## Summary
+
+total: 4
+passed: 3
+issues: 1
+pending: 0
+skipped: 0
+
+## Gaps
+
+- truth: "Controls and stems should only appear after JamTrack is synchronized"
+  status: failed
+  reason: "User reported: Not only I see the playback controls before the JamTrack been processed in the server, but I also see the tracks (stems) of that JamTrack been shown in the Session Screen. This is wrong."
+  severity: major
+  test: 3
+  root_cause: ""
+  artifacts: []
+  missing: []
+  debug_session: ""