Add TypeScript web dashboard for browsing archived briefings

Zero-runtime-dependency Node 24 server + esbuild-bundled client.
Reads reports/*.json only (never the daemon's SQLite/WAL): summary
card, dual Seoul/New York clocks, holiday-gap rows in the briefing
list, per-symbol close chart with table view, error log.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

dashboard/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "types": ["node"],
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "noFallthroughCasesInSwitch": true,
+    "forceConsistentCasingInFileNames": true,
+    "skipLibCheck": true,
+    "noEmit": true
+  },
+  "include": ["src"]
+}