Add game UI panels, keyboard shortcuts, docs narrative overhaul, and unified dev script

- Add MiniStarMap, NpcMarketPanel, ShipStatusPanel, useKeyboardShortcuts
- Add progress bars for approach/mining operations and cargo fill indicator
- Rewrite docs from spreadsheet-first to exploration-first open-world RPG
- Replace dev:db + dev:standalone with unified dev script (scripts/dev.sh)
- Add Vite chunk splitting for three.js and spacetimedb
- Fix displayName dependency in useSpacetimeConnection
- Remove stale usePlayerSession.ts
- Add AGENTS.md files across all packages

apps/AGENTS.md

@@ -0,0 +1,16 @@
+# apps/ — Application Packages
+
+Three Vite + React apps, each independently buildable and dev-serveable.
+
+| App | Port | Package | Description |
+|-----|------|---------|-------------|
+| `docs` | 5173 | `@void-nav/docs` | Living design docs, 16 doc pages, 14 interactive demos, game-slice prototype |
+| `game` | 5175 | `@void-nav/game` | Playable game client connected to SpacetimeDB backend |
+| `site` | 5174 | `@void-nav/site` | Public landing page / marketing site |
+
+## Shared
+
+- All use Tailwind CSS v4 and `@void-nav/ui` for shared primitives
+- All use Vite 7 as build tool
+- All use React 18 with TypeScript 5.8
+- `docs` and `game` also use Three.js + React Three Fiber for 3D scenes