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/components/session/sidebar/utils.tsx

@@ -1,11 +1,36 @@
 import React from 'react';
 import type { Session } from '@opencode-ai/sdk/v2';
+import { resolveGlobalSessionDirectory } from '@/stores/useGlobalSessionsStore';
+import { isSessionPinned } from '@/stores/useSessionPinnedStore';
 import { getCurrentIntlLocale } from '@/lib/i18n';
 import { formatMessage, useI18nStore } from '@/lib/i18n/store';
 
 import { normalizePath } from '@/lib/pathNormalization';
 export { normalizePath };
 
+export const selectExpandedParentKeysForContext = (
+  previous: Set<string>,
+  expanded: ReadonlySet<string>,
+  context: 'project' | 'recent',
+): Set<string> => {
+  const prefix = `${context}:`;
+  const next = new Set([...expanded].filter((key) => key.startsWith(prefix)));
+  if (previous.size === next.size && [...next].every((key) => previous.has(key))) {
+    return previous;
+  }
+  return next;
+};
+
+export const toggleExpandedParentKey = (
+  expanded: Set<string>,
+  key: string,
+): Set<string> => {
+  const next = new Set(expanded);
+  if (next.has(key)) next.delete(key);
+  else next.add(key);
+  return next;
+};
+
 const t = (key: Parameters<typeof formatMessage>[1], params?: Parameters<typeof formatMessage>[2]) =>
   formatMessage(useI18nStore.getState().dictionary, key, params);
 
@@ -132,8 +157,8 @@ export const compareSessionsByPinnedAndTime = (
   b: Session,
   pinnedSessionIds: Set<string>,
 ): number => {
-  const aPinned = pinnedSessionIds.has(a.id);
-  const bPinned = pinnedSessionIds.has(b.id);
+  const aPinned = isSessionPinned(pinnedSessionIds, resolveGlobalSessionDirectory(a), a.id);
+  const bPinned = isSessionPinned(pinnedSessionIds, resolveGlobalSessionDirectory(b), b.id);
   if (aPinned !== bPinned) {
     return aPinned ? -1 : 1;
   }