feat(telemetry): session journey view replaces raw events table

- sessions listed from client_events grouped by session id (7d window)
- timeline sheet merges page views, client events, errors, and server-fn
  activities joined by player within the session window
- vitals excluded from timelines; gap markers over 5 minutes

src/features/telemetry/queries.ts

@@ -2,7 +2,9 @@ import { useServerSuspenseQuery } from "@/lib/tanstack-query/hooks";
 import {
   getClientErrorGroups,
   getRollupRange,
+  getSessionTimeline,
   getTelemetryRuntimeStatus,
+  listSessions,
   listTelemetryAlerts,
   searchClientErrors,
   searchClientEvents,
@@ -30,6 +32,10 @@ export const telemetryKeys = {
   errorGroups: (params: ErrorGroupParams) => ["telemetry", "errorGroups", params] as const,
   rollups: (params: RollupRangeParams) => ["telemetry", "rollups", params] as const,
   alerts: (page: number) => ["telemetry", "alerts", page] as const,
+  sessions: (params: { days?: number; page?: number }) =>
+    ["telemetry", "sessions", params] as const,
+  sessionTimeline: (sessionId: string) =>
+    ["telemetry", "sessionTimeline", sessionId] as const,
   runtimeStatus: ["telemetry", "runtimeStatus"] as const,
 };
 
@@ -54,6 +60,14 @@ export const telemetryQueries = {
     queryKey: telemetryKeys.alerts(page),
     queryFn: () => listTelemetryAlerts({ data: { page } }),
   }),
+  sessions: (params: { days?: number; page?: number } = {}) => ({
+    queryKey: telemetryKeys.sessions(params),
+    queryFn: () => listSessions({ data: params }),
+  }),
+  sessionTimeline: (sessionId: string) => ({
+    queryKey: telemetryKeys.sessionTimeline(sessionId),
+    queryFn: () => getSessionTimeline({ data: { sessionId } }),
+  }),
   runtimeStatus: () => ({
     queryKey: telemetryKeys.runtimeStatus,
     queryFn: () => getTelemetryRuntimeStatus(),
@@ -72,5 +86,11 @@ export const useClientErrorGroups = (params: ErrorGroupParams) =>
 export const useRollupRange = (params: RollupRangeParams) =>
   useServerSuspenseQuery(telemetryQueries.rollups(params));
 
+export const useSessions = (params: { days?: number; page?: number } = {}) =>
+  useServerSuspenseQuery(telemetryQueries.sessions(params));
+
+export const useSessionTimeline = (sessionId: string) =>
+  useServerSuspenseQuery(telemetryQueries.sessionTimeline(sessionId));
+
 export const useTelemetryRuntimeStatus = () =>
   useServerSuspenseQuery(telemetryQueries.runtimeStatus());