feat(seer): Add context hint to dashboard LLM context node

Tell the Seer agent that dateRange/environments/projects are global
page filters scoping every widget, and that child widget nodes have
query config usable with telemetry_live_search.

Co-Authored-By: Claude Opus 4.6 <noreply@example.com>

Author: Mihir-Mavalankar

static/app/views/dashboards/dashboard.tsx

@@ -128,6 +128,8 @@ function DashboardInner({
 
   // Push dashboard metadata into the LLM context tree for Seer Explorer.
   useLLMContext({
+    contextHint:
+      'This is a Sentry dashboard. The dateRange, environments, and projects below are global page filters that scope every widget query. Each child widget node contains its own query config that can be used with the telemetry_live_search tool to fetch or drill into its data.',
     title: dashboard.title,
     widgetCount: dashboard.widgets.length,
     filters: dashboard.filters,