feat(ui): add type filter toggles

.sisyphus/boulder.json

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+{
+  "active_plan": "/home/christopher/homelab-topology/.sisyphus/plans/remaining-features.md",
+  "plan_name": "remaining-features",
+  "started_at": "2026-02-19T07:00:04.537Z",
+  "session_ids": ["ses_38d041214ffeTbENvsaL3azo8Z"]
+}

.sisyphus/evidence/task-1-health-check.json

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+{
+  "task": "Create Express Backend Foundation",
+  "timestamp": "2026-02-18T12:00:00Z",
+  "verification": {
+    "command": "curl -s http://localhost:3001/api/health",
+    "expected": "{\"status\":\"ok\"}",
+    "actual": "{\"status\":\"ok\"}",
+    "passed": true
+  },
+  "files_created": [
+    "server/index.ts"
+  ],
+  "files_modified": [
+    "package.json"
+  ],
+  "dependencies_added": [
+    "express",
+    "cors",
+    "@types/express",
+    "@types/cors"
+  ]
+}

.sisyphus/notepads/remaining-features/learnings.md

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+# Learnings - Wave 1
+
+## Task 1: Express Backend Foundation
+
+### What worked well
+- Used `bun add` to install dependencies - fast and straightforward
+- tsx is already available in devDependencies, so no additional setup needed
+- CORS configured to allow `http://localhost:3000` (frontend)
+- Health endpoint returns expected JSON: `{"status":"ok"}`
+
+### Dependencies added
+- express@5.2.1
+- cors@2.8.6
+- @types/express@5.0.6
+- @types/cors@2.8.19
+
+### Files created/modified
+- Created: `server/index.ts`
+- Modified: `package.json` (added `"server": "tsx server/index.ts"` script)
+
+### Verification
+- `curl http://localhost:3001/api/health` returns `{"status":"ok"}` ✓
+
+### Notes
+- Server runs on port 3001 to avoid conflict with frontend on port 3000
+- Minimal setup - no authentication, no WebSocket support (as per requirements)
+- Evidence saved to `.sisyphus/evidence/task-1-health-check.json`