Web UI: add token usage dashboard (#10072)

* feat(ui): Token Usage dashboard with session analytics

Adds a comprehensive Token Usage view to the dashboard:

Backend:
- Extended session-cost-usage.ts with per-session daily breakdown
- Added date range filtering (startMs/endMs) to API endpoints
- New sessions.usage, sessions.usage.timeseries, sessions.usage.logs endpoints
- Cost breakdown by token type (input/output/cache read/write)

Frontend:
- Two-column layout: Daily chart + breakdown | Sessions list
- Interactive daily bar chart with click-to-filter and shift-click range select
- Session detail panel with usage timeline, conversation logs, context weight
- Filter chips for active day/session selections
- Toggle between tokens/cost view modes (default: cost)
- Responsive design for smaller screens

UX improvements:
- 21-day default date range
- Debounced date input (400ms)
- Session list shows filtered totals when days selected
- Context weight breakdown shows skills, tools, files contribution

* fix(ui): restore gatewayUrl validation and syncUrlWithSessionKey signature

- Restore normalizeGatewayUrl() to validate ws:/wss: protocol
- Restore isTopLevelWindow() guard for iframe security
- Revert syncUrlWithSessionKey signature (host param was unused)

* feat(ui): Token Usage dashboard with session analytics

Adds a comprehensive Token Usage view to the dashboard:

Backend:
- Extended session-cost-usage.ts with per-session daily breakdown
- Added date range filtering (startMs/endMs) to API endpoints
- New sessions.usage, sessions.usage.timeseries, sessions.usage.logs endpoints
- Cost breakdown by token type (input/output/cache read/write)

Frontend:
- Two-column layout: Daily chart + breakdown | Sessions list
- Interactive daily bar chart with click-to-filter and shift-click range select
- Session detail panel with usage timeline, conversation logs, context weight
- Filter chips for active day/session selections
- Toggle between tokens/cost view modes (default: cost)
- Responsive design for smaller screens

UX improvements:
- 21-day default date range
- Debounced date input (400ms)
- Session list shows filtered totals when days selected
- Context weight breakdown shows skills, tools, files contribution

* fix: usage dashboard data + cost handling (#8462) (thanks @mcinteerj)

* Usage: enrich metrics dashboard

* Usage: add latency + model trends

* Gateway: improve usage log parsing

* UI: add usage query helpers

* UI: client-side usage filter + debounce

* Build: harden write-cli-compat timing

* UI: add conversation log filters

* UI: fix usage dashboard lint + state

* Web UI: default usage dates to local day

* Protocol: sync session usage params (#8462) (thanks @mcinteerj, @TakHoffman)

---------

Co-authored-by: Jake McInteer <mcinteerj@gmail.com>

scripts/write-cli-compat.ts

@@ -6,9 +6,18 @@ const rootDir = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..")
 const distDir = path.join(rootDir, "dist");
 const cliDir = path.join(distDir, "cli");
 
-const candidates = fs
-  .readdirSync(distDir)
-  .filter((entry) => entry.startsWith("daemon-cli-") && entry.endsWith(".js"));
+const findCandidates = () =>
+  fs
+    .readdirSync(distDir)
+    .filter((entry) => entry.startsWith("daemon-cli-") && entry.endsWith(".js"));
+
+// In rare cases, build output can land slightly after this script starts (depending on FS timing).
+// Retry briefly to avoid flaky builds.
+let candidates = findCandidates();
+for (let i = 0; i < 10 && candidates.length === 0; i++) {
+  await new Promise((resolve) => setTimeout(resolve, 50));
+  candidates = findCandidates();
+}
 
 if (candidates.length === 0) {
   throw new Error("No daemon-cli bundle found in dist; cannot write legacy CLI shim.");