feat: app icon redesign, store assets, brand identity docs (batch v0.2.5)
- Redraw adaptive icon layers (background + foreground) with Closer palette colors
- Add monochrome icon layer for Android 13+ themed icons
- Add mipmap-anydpi-v33 adaptive icon configs (round + standard)
- Add store assets: 512px app icon, 1024x500 feature graphic, source SVGs
- Add docs/brand/visual-identity.md with brand mark, color palette, store voice, asset rules
- Update store-assets.md checklist to reflect completed items
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