feat: component library, markdown renderer, multi-workspace dashboard

- Add PeerCardViewer with collapsible ALL_CAPS sections and title-case metadata table
- Add MarkdownRenderer (react-markdown + remark-gfm) with TimestampChip (Luxon)
- Add Badge, Card, Collapsible shadcn/ui components
- Rebuild Dashboard with per-workspace queue table and aggregate stats
- Add metadata.source chip to SessionList, observe_me badge to PeerList
- Make session_id in ConclusionBrowser a clickable link
- Fix sessionPeers pagination crash (unwrap .items from Page_Peer_ response)
- Add COLOR constants (src/lib/constants.ts) and localized formatCount (Intl)
- Fix dark mode contrast: text-2/3/4 vars, global font-size baseline

package.json

@@ -17,14 +17,21 @@
   "dependencies": {
     "@fontsource/dm-mono": "^5.2.7",
     "@fontsource/dm-sans": "^5.2.8",
+    "@radix-ui/react-collapsible": "^1.1.12",
     "@tailwindcss/vite": "^4.2.4",
     "@tanstack/react-query": "^5.74.4",
     "@tanstack/react-router": "^1.120.3",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
     "framer-motion": "^12.38.0",
     "lucide-react": "^1.11.0",
+    "luxon": "^3.7.2",
     "openapi-fetch": "^0.13.5",
     "react": "^19.2.5",
     "react-dom": "^19.2.5",
+    "react-markdown": "^10.1.0",
+    "remark-gfm": "^4.0.1",
+    "tailwind-merge": "^3.5.0",
     "tailwindcss": "^4.2.4",
     "zod": "^3.24.3"
   },
@@ -34,6 +41,7 @@
     "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/react": "^16.3.0",
     "@testing-library/user-event": "^14.6.1",
+    "@types/luxon": "^3.7.1",
     "@types/node": "^25.6.0",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",