fix(bootsplash): restore curated splash assets; stop overwriting assets/bootsplash

- Restore assets/bootsplash, Android drawables, and iOS BootSplash (c4ffc4) from pre-regenerate tree
- bootsplash-generate: write CLI scales to assets/bootsplash-generated/ (gitignored); logo-width 160
- Document curated vs generated paths in development.md

Made-with: Cursor

Author: maximcoding

.gitignore

@@ -82,3 +82,7 @@ yarn-error.log
 # Claude Code local overrides and agent memory
 .claude/settings.local.json
 .claude/agent-memory-local/
+
+# CLI-only splash scales (see scripts/bootsplash-generate.cjs)
+assets/bootsplash-generated/
+