Replaces the old two-tile project landing with a tabbed shell anchored
on three sections: Product (codebases), Infrastructure (swappable
services), Hosting (runtime + reachability). Bare project URL
redirects to /product so the founder always lands on the most
actionable surface.
Product tab is the only one wired with real data so far: each
codebase tile is selectable and renders a lazy-loading Gitea file
tree for apps/<codebase>/ in the right column. Both columns share
height + a heading slot so panels stay visually aligned even when
the right side is sparse.
Infrastructure and Hosting are stubs ready for Phase 2 wiring (no
behavioural change vs today). The old (workspace)/infrastructure
route is removed in favour of the new tab; the other 15 sidebar
routes are untouched and still reachable for the migration window.
Made-with: Cursor
Mark Henderson
69c3a1258c