Record Player flow, Streak and identity decisions

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/adr/0004-player-flow-streak-and-identity.md

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+# ADR 0004 — Player flow, Streak and app identity
+
+Status: Accepted (2026-10-28)
+
+1. **Sound**: One soft chime per Mode, only on timer end / next item. Mixes with other audio. Mute toggle.
+2. **Workout rest**: No countdown and no rest settings. A count-up Rest Screen with "Start next set".
+3. **Stretching flow**: Automatic, with Transitions (per-Plan length, default 5 s).
+4. **Supersets**: Workout only; one set count; round-robin; optional rest between Exercises in a round.
+5. **Streak**: One daily Streak across both Modes, kept subtle; any complete Session counts, no minimum.
+   Local notifications are in scope for v1 (to help keep the Streak).
+6. **Theme**: Fixed look per Mode, no light/dark setting for now.
+7. **Fonts**: Nunito (Stretching), Barlow Condensed (Workout).
+8. **App ID**: `de.zendric.zenxercise`.