fix: Restore version info in sidebar (moved from footer) & cleanup journal

style: Update footer copyright to DtmOjaji & remove version notation

style: Implement High-Contrast Minimalism UI & feat: Hybrid Search (FTS5 BM25) ...

- Refactored UI to follow minimalist HUD design spec.
- Replaced LSA-only search with Hybrid Search (Vector + FTS5 BM25).
- Integrated trigram tokenizer for robust Japanese keyword matching.
- Fixed MCP activity log rendering issues.
- Updated documentation and added MIT LICENSE.
- Updated work journal.