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/session-deletion-cleanup.ts

@@ -0,0 +1,24 @@
+import { getRuntimeKey } from '@/lib/runtime-switch';
+import { clearChatDraft, createChatDraftIdentity } from '@/lib/chatDraftPersistence';
+import { createMessageQueueTarget, useMessageQueueStore } from '@/stores/messageQueueStore';
+import { useSessionFoldersStore } from '@/stores/useSessionFoldersStore';
+import { useTodosPersistStore } from '@/stores/useTodosPersistStore';
+import { useInlineCommentDraftStore } from '@/stores/useInlineCommentDraftStore';
+import { useSessionPinnedStore } from '@/stores/useSessionPinnedStore';
+
+export const cleanupPersistedSessionState = (identity: {
+  runtimeKey: string;
+  directory: string;
+  sessionId: string;
+}): void => {
+  if (identity.runtimeKey !== getRuntimeKey() || !identity.directory || identity.directory === 'global' || !identity.sessionId) return;
+
+  const queueTarget = createMessageQueueTarget(identity.sessionId, identity.directory, identity.runtimeKey);
+  if (queueTarget) useMessageQueueStore.getState().clearQueue(queueTarget);
+  useTodosPersistStore.getState().clearSessionTodos(identity.runtimeKey, identity.directory, identity.sessionId);
+  useSessionFoldersStore.getState().removeSessionEverywhere(identity.runtimeKey, identity.sessionId);
+  useInlineCommentDraftStore.getState().clearSessionDrafts(identity.runtimeKey, identity.directory, identity.sessionId);
+  useSessionPinnedStore.getState().clearPinnedSession(identity.runtimeKey, identity.directory, identity.sessionId);
+  const chatDraftIdentity = createChatDraftIdentity(identity.runtimeKey, identity.directory, identity.sessionId);
+  if (chatDraftIdentity) clearChatDraft(chatDraftIdentity, true);
+};