Record Streak, Grace Hour and Reminder decisions

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

future_ideas.md

@@ -13,4 +13,5 @@ Things deliberately left out of v1.
 - Vibration cues and voice guidance in the Player
 - Translations (v1 is English only)
 - Light/dark setting per Mode (v1 has a fixed look per Mode)
+- Full-screen Streak celebrations and milestones (7/30/100/365 days)
 - Mixed Plans that combine Stretching and Workout (e.g. warm-up, workout, cool-down)