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/stores/useFileSearchStore.ts

@@ -1,6 +1,7 @@
 import { create } from 'zustand';
 import { devtools } from 'zustand/middleware';
 import { opencodeClient, type ProjectFileSearchHit } from '@/lib/opencode/client';
+import { getRuntimeKey } from '@/lib/runtime-switch';
 
 const CACHE_TTL_MS = 30_000;
 const MAX_CACHE_ENTRIES = 40;
@@ -22,9 +23,11 @@ interface FileSearchStoreState {
     options?: { includeHidden?: boolean; respectGitignore?: boolean; type?: 'file' | 'directory' }
   ) => Promise<ProjectFileSearchHit[]>;
   invalidateDirectory: (directory?: string | null) => void;
+  resetForRuntimeSwitch: () => void;
 }
 
 const buildCacheKey = (
+  runtimeKey: string,
   directory: string,
   query: string,
   limit: number,
@@ -34,13 +37,13 @@ const buildCacheKey = (
 ) => {
   const normalizedDirectory = directory.trim();
   const normalizedQuery = query.trim().toLowerCase();
-  return JSON.stringify([normalizedDirectory, normalizedQuery, limit, includeHidden, respectGitignore, type]);
+  return JSON.stringify([runtimeKey, normalizedDirectory, normalizedQuery, limit, includeHidden, respectGitignore, type]);
 };
 
 const cacheKeyMatchesDirectory = (cacheKey: string, directory: string) => {
   try {
     const value: unknown = JSON.parse(cacheKey);
-    return Array.isArray(value) && value[0] === directory;
+    return Array.isArray(value) && value[1] === directory;
   } catch {
     return false;
   }
@@ -58,11 +61,12 @@ export const useFileSearchStore = create<FileSearchStoreState>()(
         }
 
         const normalizedDirectory = directory.trim();
+        const runtimeKey = getRuntimeKey();
         const normalizedQuery = typeof query === 'string' ? query.trim() : '';
         const includeHidden = Boolean(options?.includeHidden);
         const respectGitignore = options?.respectGitignore ?? true;
         const type = options?.type === 'directory' ? 'directory' : 'file';
-        const key = buildCacheKey(normalizedDirectory, normalizedQuery, limit, includeHidden, respectGitignore, type);
+        const key = buildCacheKey(runtimeKey, normalizedDirectory, normalizedQuery, limit, includeHidden, respectGitignore, type);
         const now = Date.now();
         const cached = get().cache[key];
 
@@ -159,6 +163,9 @@ export const useFileSearchStore = create<FileSearchStoreState>()(
           };
         });
       },
+      resetForRuntimeSwitch() {
+        set({ cache: {}, cacheKeys: [], inFlight: {} });
+      },
     }),
     {
       name: 'file-search-store',