Add non-negotiable engineering principles, technology convention rules
with language-specific examples, and code quality/structure guidelines.
Renumber existing sections to fit the expanded structure.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- Refined dark theme with zinc palette and indigo accents
- Clean sidebar showing only project/session tree
- Moved pattern management to full-screen settings panel
- New session modal with project + pattern picker
- Modern chat with avatar icons, inline send button, Enter-to-send
- Welcome pane when no session is selected
- Added lucide-react for consistent iconography
- Custom scrollbar styling and auto-resize textarea
- Removed clutter: no sidebar pattern list, no verbose headers
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
