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

packages/ui/AGENTS.md

@@ -0,0 +1,31 @@
+# packages/ui — Shared UI Primitives & Design Tokens
+
+Package: `@void-nav/ui`
+Exports: `Button`, `Panel` components and a CSS design token system.
+
+## Structure
+
+```
+src/
+  index.ts         Barrel export: Button, Panel
+  primitives/
+    Button.tsx     Button component with variant support
+    Panel.tsx      Panel/card container component
+  styles.css       Design tokens (dark space theme)
+```
+
+## Design Tokens
+
+The CSS file in `src/styles.css` defines the visual identity of the entire project:
+
+- **15 color tokens** — dark space palette (bg, fg, surface, accent, cyan, green, purple, red, muted, border)
+- **3 font stacks** — display (Space Grotesk), body (Inter), mono (JetBrains Mono)
+- **Border radius**, spacing, and shadow scales
+
+These tokens are imported by `apps/game` and `apps/site` via Tailwind CSS `@import`.
+
+## Conventions
+
+- Components are minimal — they define structure, not complex behavior
+- No external dependencies beyond React peer dependency
+- Styles use CSS custom properties, not Tailwind classes directly (consumers apply Tailwind)