perf: overhaul session loading, caching, and runtime isolation (#2360)

Improve OpenChamber responsiveness under large session workloads while fixing
cache, synchronization, and persistence correctness across runtimes, projects,
directories, and worktrees.

- prioritize selected and visible sessions during bootstrap and defer
  non-critical enrichment work
- reduce redundant message loading, event processing, store publication, and
  hidden sidebar work
- prevent stale session and message requests from overwriting newer
  authoritative state
- preserve existing data when authoritative fetches fail instead of treating
  failures as successful empty responses
- scope session materialization, messages, drafts, queues, todos, pins,
  permissions, folders, tabs, Git state, and pull request data by runtime and
  directory identity
- harden runtime switching, reconnect, cleanup, mutation reconciliation, and
  persisted-state ordering
- preserve live subagent Task linkage when metadata arrives after an older
  message request or while streaming parts are suspended
- coalesce overlapping tail refreshes without losing newer refresh demand
- improve cold-session loading by moving deferrable work out of the critical
  bootstrap path
- isolate URL authentication, mobile credentials, native secrets, and other
  runtime-owned state across endpoint changes
- bound long-lived caches and remove avoidable allocations from event and
  rendering hot paths
- limit virtualization to archive collections where it improves rendering
  without disrupting active sidebar layout
- stabilize session folders, pin ordering, expanded state, and persisted
  sidebar behavior
- open skill files through the same secure editor and outside-workspace grant
  flow used by file navigation, including worktree sessions
- expand regression coverage for stale completions, runtime collisions,
  reconnect behavior, persistence races, authoritative empty results, and
  subagent refresh ordering
- document the updated synchronization, cache ownership, performance, and
  runtime-isolation invariants

packages/ui/src/sync/global-session-status.test.ts

@@ -0,0 +1,45 @@
+import { beforeEach, describe, expect, test } from "bun:test"
+import type { Event } from "@opencode-ai/sdk/v2/client"
+import {
+  applyGlobalSessionStatusEvent,
+  applyGlobalSessionStatusSnapshot,
+  useGlobalSessionStatusStore,
+} from "./global-session-status"
+
+beforeEach(() => {
+  useGlobalSessionStatusStore.setState({ statusById: new Map() })
+})
+
+describe("global session status index", () => {
+  test("preserves full retry status details from live events", () => {
+    applyGlobalSessionStatusEvent("/repo", {
+      type: "session.status",
+      properties: {
+        sessionID: "session-a",
+        status: { type: "retry", attempt: 2, message: "waiting" },
+      },
+    } as Event)
+
+    expect(useGlobalSessionStatusStore.getState().statusById.get("session-a")?.status).toEqual({
+      type: "retry",
+      attempt: 2,
+      message: "waiting",
+    })
+  })
+
+  test("authoritative snapshots clear absent active entries for their directory", () => {
+    applyGlobalSessionStatusSnapshot("/repo", { "session-a": { type: "busy" } }, ["session-a"])
+    expect(useGlobalSessionStatusStore.getState().statusById.get("session-a")?.status.type).toBe("busy")
+
+    applyGlobalSessionStatusSnapshot("/repo", {}, ["session-a"])
+    expect(useGlobalSessionStatusStore.getState().statusById.has("session-a")).toBe(false)
+  })
+
+  test("clears an explicitly idle known session when directory aliases differ", () => {
+    applyGlobalSessionStatusSnapshot("/canonical/repo", { "session-a": { type: "busy" } }, ["session-a"])
+
+    applyGlobalSessionStatusSnapshot("/alias/repo", { "session-a": { type: "idle" } }, ["session-a"])
+
+    expect(useGlobalSessionStatusStore.getState().statusById.has("session-a")).toBe(false)
+  })
+})