feat(folder): unify workspace state streaming for tree and git panels

Introduce a shared workspace-state backend stream with snapshot/delta APIs for file tree and git changes.

Migrate both aux panels to a common frontend workspace store with lifecycle-safe stream handling.

Apply batched watch throttling, path-aware git refresh gating, no-op delta suppression, and bounded history compaction to improve runtime stability.

src/lib/api.ts

@@ -42,6 +42,7 @@ import type {
   FilePreviewContent,
   FileEditContent,
   FileSaveResult,
+  WorkspaceSnapshotResponse,
   GitLogResult,
   SystemLanguageSettings,
   SystemProxySettings,
@@ -1267,12 +1268,26 @@ export async function getFileTree(
   })
 }
 
-export async function startFileTreeWatch(rootPath: string): Promise<void> {
-  return getTransport().call("start_file_tree_watch", { rootPath })
+export async function startWorkspaceStateStream(
+  rootPath: string
+): Promise<WorkspaceSnapshotResponse> {
+  return getTransport().call("start_workspace_state_stream", { rootPath })
 }
 
-export async function stopFileTreeWatch(rootPath: string): Promise<void> {
-  return getTransport().call("stop_file_tree_watch", { rootPath })
+export async function stopWorkspaceStateStream(
+  rootPath: string
+): Promise<void> {
+  return getTransport().call("stop_workspace_state_stream", { rootPath })
+}
+
+export async function getWorkspaceSnapshot(
+  rootPath: string,
+  sinceSeq?: number
+): Promise<WorkspaceSnapshotResponse> {
+  return getTransport().call("get_workspace_snapshot", {
+    rootPath,
+    sinceSeq: sinceSeq ?? null,
+  })
 }
 
 export async function readFileBase64(

src/lib/tauri.ts

@@ -40,6 +40,7 @@ import type {
   FilePreviewContent,
   FileEditContent,
   FileSaveResult,
+  WorkspaceSnapshotResponse,
   GitLogResult,
   SystemLanguageSettings,
   SystemProxySettings,
@@ -1010,12 +1011,26 @@ export async function getFileTree(
   return invoke("get_file_tree", { path, maxDepth: maxDepth ?? null })
 }
 
-export async function startFileTreeWatch(rootPath: string): Promise<void> {
-  return invoke("start_file_tree_watch", { rootPath })
+export async function startWorkspaceStateStream(
+  rootPath: string
+): Promise<WorkspaceSnapshotResponse> {
+  return invoke("start_workspace_state_stream", { rootPath })
 }
 
-export async function stopFileTreeWatch(rootPath: string): Promise<void> {
-  return invoke("stop_file_tree_watch", { rootPath })
+export async function stopWorkspaceStateStream(
+  rootPath: string
+): Promise<void> {
+  return invoke("stop_workspace_state_stream", { rootPath })
+}
+
+export async function getWorkspaceSnapshot(
+  rootPath: string,
+  sinceSeq?: number
+): Promise<WorkspaceSnapshotResponse> {
+  return invoke("get_workspace_snapshot", {
+    rootPath,
+    sinceSeq: sinceSeq ?? null,
+  })
 }
 
 export async function readFileBase64(

src/lib/types.ts

@@ -831,12 +831,42 @@ export interface FileSaveResult {
   line_ending: "lf" | "crlf" | "mixed" | "none"
 }
 
-export interface FileTreeChangedEvent {
+export interface WorkspaceGitEntry {
+  path: string
+  status: string
+  additions: number
+  deletions: number
+}
+
+export type WorkspaceDelta =
+  | { kind: "tree_replace"; nodes: FileTreeNode[] }
+  | { kind: "git_replace"; entries: WorkspaceGitEntry[] }
+  | { kind: "meta"; reason: string }
+
+export interface WorkspaceDeltaEnvelope {
+  seq: number
+  kind: "fs_delta" | "git_delta" | "meta" | "resync_hint" | string
+  payload: WorkspaceDelta[]
+  requires_resync: boolean
+}
+
+export interface WorkspaceStateEvent {
   root_path: string
-  changed_paths: string[]
-  kind: "create" | "modify" | "remove" | "access" | "any" | "other"
-  full_reload: boolean
-  refresh_git_status: boolean
+  seq: number
+  version: number
+  kind: "fs_delta" | "git_delta" | "meta" | "resync_hint" | string
+  payload: WorkspaceDelta[]
+  requires_resync: boolean
+}
+
+export interface WorkspaceSnapshotResponse {
+  root_path: string
+  seq: number
+  version: number
+  full: boolean
+  tree_snapshot: FileTreeNode[] | null
+  git_snapshot: WorkspaceGitEntry[] | null
+  deltas: WorkspaceDeltaEnvelope[]
 }
 
 export interface GitLogResult {