## Summary
- lazy-load the markdown and diff render paths so they stop inflating
initial UI startup work
- move shared text rendering helpers out of the markdown path and keep
diff rendering on the deferred path
- defer the Monaco secondary viewers so the markdown and diff path no
longer keeps that work in the main bundle
## Follow-ups
- related fork follow-up: Pagecran/CodeNomad#1
- that follow-up is now independent on dev and only keeps the remaining
right panel, picker, and tool-call secondary chunking work
## Testing
- npm run typecheck --workspace @codenomad/ui
- npm run build --workspace @codenomad/ui
Replace split/unified and context controls with icon toggles, add a word-wrap toggle (default on), and move the toolbar into the tab header to free vertical space.
Render SplitFilePanel consistently and move empty/loading messages into the viewer area so the right drawer keeps its standard layout even when there are no session diffs, no git changes, or files are still loading.
Split InstanceShell2 into focused shell modules (drawer chrome/resize, session context/cache, sidebar, right panel tabs/components) to improve maintainability while preserving behavior.
