refactor: code quality cleanup — remove any types, add logger, rename Kine to Tabata

- Phase 0: Rename all Kine references to Tabata (types, files, imports, i18n, analytics events)
- Phase 1: Add test coverage for tabataProgramStore, workoutProgramStore, and color utils (47 tests)
- Phase 2: Remove all `any` types from production code with proper typed replacements
- Phase 3: Replace ~60 raw console.* calls with __DEV__-gated logger utility
- Phase 4: Verify .DS_Store housekeeping (already clean)

0 TypeScript errors, 583/583 tests passing.

scripts/remove_bg.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+"""Remove background from mascot.gif frame-by-frame using rembg."""
+
+import sys
+from pathlib import Path
+
+try:
+    from rembg import remove
+    from PIL import Image
+except ImportError:
+    print("Missing dependencies. Install with:")
+    print("  pip install rembg Pillow")
+    sys.exit(1)
+
+INPUT = Path(__file__).resolve().parent.parent / "assets" / "mascot.gif"
+OUTPUT = Path(__file__).resolve().parent.parent / "assets" / "mascot_nobg.gif"
+
+
+def main():
+    if not INPUT.exists():
+        print(f"Input not found: {INPUT}")
+        sys.exit(1)
+
+    print(f"Reading {INPUT}...")
+    original = Image.open(INPUT)
+
+    frames = []
+    durations = []
+    try:
+        while True:
+            durations.append(original.info.get("duration", 100))
+            frame = original.convert("RGBA")
+            print(f"  Processing frame {len(frames) + 1}...")
+            frames.append(remove(frame))
+            original.seek(original.tell() + 1)
+    except EOFError:
+        pass
+
+    print(f"Saving {len(frames)} frames to {OUTPUT}...")
+    frames[0].save(
+        OUTPUT,
+        save_all=True,
+        append_images=frames[1:],
+        duration=durations,
+        loop=0,
+        disposal=2,
+    )
+    print(f"Done → {OUTPUT}")
+
+
+if __name__ == "__main__":
+    main()