fix(git): bound status payload and repo discovery; add reset escape hatch (#369)

Opening the source-control panel could freeze the whole sidebar, and the
frozen layout restored itself after every reload, leaving no way out
(issue #369). Three unbounded layers compounded:

- `git status --porcelain -z --untracked-files=all` shipped every row of a
  pathological untracked set into one response; the browser main thread
  froze on response.json() plus the unvirtualized change list, and the 2s
  poll replayed the freeze. status() now caps entries at 2000 and reports
  `truncated` (the panel shows a notice, mirroring fs.read's truncation
  semantics); worktree change counts inherit the bound for free.
- repoRoots() probed every visible child directory of a non-repo cwd
  (e.g. ~) serially, once per git.* call, each with the full 30s command
  budget. Discovery now uses a 3s probe timeout, caps probes at 200
  directories, and shares one in-flight scan plus a 60s TTL cache per cwd.
- A hung layout persisted `panelOpen: true` with the git tab active, so a
  reload remounted straight back into the freeze with no escape hatch.
  Loading with `?dsh-sidebar-reset` now drops the persisted layout (and
  the shared width) and starts from the default.

statusTruncated copy synced across all 19 shipped dictionaries.

src/client/GitView.tsx

@@ -471,6 +471,9 @@ export function GitView(props: {
 
       {status !== null && status.isRepo && (
         <>
+          {status.truncated === true && (
+            <div className={css.gitEmpty}>{t('statusTruncated')}</div>
+          )}
           <div className={css.gitSection}>
             <div className={css.gitSectionHeader}>
               <span>{t('staged')} ({stagedEntries.length})</span>

src/client/api.ts

@@ -44,6 +44,9 @@ export interface GitStatusResult {
   isRepo: boolean
   branch?: string
   entries: GitStatusEntry[]
+  /** True when the host capped `entries` (huge untracked set); the panel
+   *  shows a truncation notice instead of freezing (#369). */
+  truncated?: boolean
   root?: string
   repositories?: string[]
 }

src/client/locales-ar.ts

@@ -105,6 +105,7 @@ export const ar: Record<string, string> = {
   splitDown: 'تقسيم لأسفل',
   notRepo: 'هذا الدليل ليس مستودع git',
   noChanges: 'لا تغييرات',
+  statusTruncated: 'التغييرات كثيرة جدًا؛ يتم عرض أول 2000 إدخال فقط',
   stage: 'إدراج',
   unstage: 'إلغاء الإدراج',
   stageAll: 'إدراج الكل',

src/client/locales-de.ts

@@ -90,6 +90,7 @@ export const de: Record<string, string> = {
   splitDown: 'Nach unten teilen',
   notRepo: 'Dieses Verzeichnis ist kein Git-Repository',
   noChanges: 'Keine Änderungen',
+  statusTruncated: 'Zu viele Änderungen; nur die ersten 2000 Einträge werden angezeigt',
   stage: 'Stagen',
   unstage: 'Unstagen',
   stageAll: 'Alle stagen',

src/client/locales-fr.ts

@@ -97,6 +97,7 @@ export const fr: Record<string, string> = {
   splitDown: 'Diviser en bas',
   notRepo: 'Ce répertoire n’est pas un dépôt git',
   noChanges: 'Aucune modification',
+  statusTruncated: 'Trop de modifications ; seules les 2000 premières entrées sont affichées',
   stage: 'Mettre en scène',
   unstage: 'Annuler la mise en scène',
   stageAll: 'Tout mettre en scène',

src/client/locales-hi.ts

@@ -104,6 +104,7 @@ export const hi: Record<string, string> = {
   splitDown: 'नीचे स्प्लिट',
   notRepo: 'यह डायरेक्टरी एक git रिपॉज़िटरी नहीं है',
   noChanges: 'कोई बदलाव नहीं',
+  statusTruncated: 'बहुत अधिक बदलाव; केवल पहली 2000 प्रविष्टियाँ दिखाई जा रही हैं',
   stage: 'स्टेज',
   unstage: 'अनस्टेज',
   stageAll: 'सभी स्टेज करें',

src/client/locales-id.ts

@@ -102,6 +102,7 @@ export const id: Record<string, string> = {
   splitDown: 'Bagi ke bawah',
   notRepo: 'Direktori ini bukan repositori git',
   noChanges: 'Tidak ada perubahan',
+  statusTruncated: 'Terlalu banyak perubahan; hanya 2000 entri pertama yang ditampilkan',
   stage: 'Stage',
   unstage: 'Unstage',
   stageAll: 'Stage semua',

src/client/locales-it.ts

@@ -95,6 +95,7 @@ export const it: Record<string, string> = {
   splitDown: 'Dividi in basso',
   notRepo: 'Questa directory non è un repository git',
   noChanges: 'Nessuna modifica',
+  statusTruncated: 'Troppe modifiche; vengono mostrate solo le prime 2000 voci',
   stage: 'Prepara',
   unstage: 'Rimuovi dalla preparazione',
   stageAll: 'Prepara tutto',

src/client/locales-ja.ts

@@ -104,6 +104,7 @@ export const ja: Record<string, string> = {
   splitDown: '下に分割',
   notRepo: 'このディレクトリは git リポジトリではありません',
   noChanges: '変更はありません',
+  statusTruncated: '変更が多すぎるため、最初の 2000 件のみ表示しています',
   stage: 'ステージ',
   unstage: 'ステージ解除',
   stageAll: 'すべてステージ',

src/client/locales-ko.ts

@@ -96,6 +96,7 @@ export const ko: Record<string, string> = {
   splitDown: '아래로 분할',
   notRepo: '현재 디렉터리는 git 저장소가 아닙니다',
   noChanges: '변경 사항 없음',
+  statusTruncated: '변경 사항이 너무 많아 처음 2000개만 표시합니다',
   stage: '스테이징',
   unstage: '스테이징 해제',
   stageAll: '모두 스테이징',

src/client/locales-nl.ts

@@ -102,6 +102,7 @@ export const nl: Record<string, string> = {
   splitDown: 'Splitsen omlaag',
   notRepo: 'Deze map is geen git-repository',
   noChanges: 'Geen wijzigingen',
+  statusTruncated: 'Te veel wijzigingen; alleen de eerste 2000 items worden weergegeven',
   stage: 'Stagen',
   unstage: 'Unstagen',
   stageAll: 'Alles stagen',

src/client/locales-pl.ts

@@ -106,6 +106,7 @@ export const pl: Record<string, string> = {
   splitDown: 'Podziel w dół',
   notRepo: 'Ten katalog nie jest repozytorium git',
   noChanges: 'Brak zmian',
+  statusTruncated: 'Zbyt wiele zmian; pokazywane jest tylko pierwsze 2000 wpisów',
   stage: 'Dodaj do indeksu',
   unstage: 'Usuń z indeksu',
   stageAll: 'Dodaj wszystko do indeksu',

src/client/locales-pt.ts

@@ -87,6 +87,7 @@ export const pt: Record<string, string> = {
   splitDown: 'Dividir abaixo',
   notRepo: 'Este diretório não é um repositório git',
   noChanges: 'Sem alterações',
+  statusTruncated: 'Muitas alterações; exibindo apenas as primeiras 2000 entradas',
   stage: 'Preparar (stage)',
   unstage: 'Desfazer stage',
   stageAll: 'Preparar tudo',

src/client/locales-ru.ts

@@ -100,6 +100,7 @@ export const ru: Record<string, string> = {
   splitDown: 'Разделить вниз',
   notRepo: 'Этот каталог не является git-репозиторием',
   noChanges: 'Нет изменений',
+  statusTruncated: 'Слишком много изменений; показаны только первые 2000 записей',
   stage: 'Индексировать',
   unstage: 'Убрать из индекса',
   stageAll: 'Индексировать всё',

src/client/locales-sv.ts

@@ -87,6 +87,7 @@ export const sv: Record<string, string> = {
   splitDown: 'Dela ner',
   notRepo: 'Denna katalog är inte ett Git-arkiv',
   noChanges: 'Inga ändringar',
+  statusTruncated: 'För många ändringar; endast de första 2000 posterna visas',
   stage: 'Köa',
   unstage: 'Avköa',
   stageAll: 'Köa alla',

src/client/locales-th.ts

@@ -104,6 +104,7 @@ export const th: Record<string, string> = {
   splitDown: 'แยกลง',
   notRepo: 'ไดเรกทอรีนี้ไม่ใช่ git repository',
   noChanges: 'ไม่มีการเปลี่ยนแปลง',
+  statusTruncated: 'การเปลี่ยนแปลงมากเกินไป แสดงเพียง 2000 รายการแรก',
   stage: 'Stage',
   unstage: 'Unstage',
   stageAll: 'Stage ทั้งหมด',

src/client/locales-tr.ts

@@ -104,6 +104,7 @@ export const tr: Record<string, string> = {
   splitDown: 'Aşağı böl',
   notRepo: 'Bu dizin bir git deposu değil',
   noChanges: 'Değişiklik yok',
+  statusTruncated: 'Çok fazla değişiklik var; yalnızca ilk 2000 giriş gösteriliyor',
   stage: 'Sahnele',
   unstage: 'Sahnelemeden kaldır',
   stageAll: 'Tümünü sahnele',

src/client/locales-vi.ts

@@ -104,6 +104,7 @@ export const vi: Record<string, string> = {
   splitDown: 'Chia xuống dưới',
   notRepo: 'Thư mục hiện tại không phải repo git',
   noChanges: 'Không có thay đổi',
+  statusTruncated: 'Quá nhiều thay đổi; chỉ hiển thị 2000 mục đầu tiên',
   stage: 'Stage',
   unstage: 'Unstage',
   stageAll: 'Stage tất cả',

src/client/locales-zh-HK.ts

@@ -119,6 +119,7 @@ export const zhHK: Record<string, string> = {
   splitDown: '向下分欄',
   notRepo: '目前目錄不是 git 倉庫',
   noChanges: '沒有變更',
+  statusTruncated: '變更過多，僅顯示前 2000 條',
   stage: '暫存',
   unstage: '取消暫存',
   stageAll: '全部暫存',

src/client/locales-zh-MO.ts

@@ -119,6 +119,7 @@ export const zhMO: Record<string, string> = {
   splitDown: '向下分欄',
   notRepo: '目前目錄不是 git 倉庫',
   noChanges: '沒有變更',
+  statusTruncated: '變更過多，僅顯示前 2000 條',
   stage: '暫存',
   unstage: '取消暫存',
   stageAll: '全部暫存',

src/client/locales-zh-TW.ts

@@ -119,6 +119,7 @@ export const zhTW: Record<string, string> = {
   splitDown: '向下分欄',
   notRepo: '目前目錄不是 git 倉庫',
   noChanges: '沒有變更',
+  statusTruncated: '變更過多，僅顯示前 2000 條',
   stage: '暫存',
   unstage: '取消暫存',
   stageAll: '全部暫存',

src/client/locales.ts

@@ -110,6 +110,7 @@ export const zh = {
   splitDown: '向下分栏',
   notRepo: '当前目录不是 git 仓库',
   noChanges: '没有变更',
+  statusTruncated: '变更过多，仅显示前 2000 条',
   stage: '暂存',
   unstage: '取消暂存',
   stageAll: '全部暂存',
@@ -453,6 +454,7 @@ export const en: Record<keyof typeof zh, string> = {
   splitDown: 'Split down',
   notRepo: 'This directory is not a git repository',
   noChanges: 'No changes',
+  statusTruncated: 'Too many changes; showing the first 2,000 entries',
   stage: 'Stage',
   unstage: 'Unstage',
   stageAll: 'Stage all',

src/client/state.ts

@@ -1036,25 +1036,55 @@ export function defaultWidthFor(viewport: number, percent: number): number {
   return Math.min(viewport, Math.max(PANEL_MIN, Math.round(viewport * percent / 100)))
 }
 
+/**
+ * URL escape hatch (#369): loading the app with `?dsh-sidebar-reset` drops
+ * the persisted layout for the session instead of restoring it. When a
+ * restored tab hangs the page on mount (the #369 freeze loop), reloading
+ * into the same state replays the hang forever; this param starts from the
+ * default layout and clears the stored copy, breaking the loop. Persisting
+ * resumes as soon as the param is gone from the URL.
+ */
+const RESET_PARAM = 'dsh-sidebar-reset'
+
+/** Whether the current page load asked for a persisted-state reset. */
+function resetRequested(): boolean {
+  try {
+    return new URLSearchParams(window.location.search).has(RESET_PARAM)
+  } catch {
+    return false
+  }
+}
+
 function loadState(sessionId: string, prefs: SidebarPrefs): SidebarState {
+  const reset = resetRequested()
+  if (reset) {
+    try {
+      localStorage.removeItem(`${STORAGE_PREFIX}:${sessionId}`)
+      localStorage.removeItem(GLOBAL_WIDTH_KEY)
+    } catch {
+      // Storage unavailable: the default layout below is still the escape.
+    }
+  }
   // The panel width is a cross-session preference: the last dragged width
   // wins over a session's own persisted value, so switching conversations
   // keeps the width the user chose anywhere.
-  const globalWidth = readGlobalWidth()
-  try {
-    const raw = localStorage.getItem(`${STORAGE_PREFIX}:${sessionId}`)
-    if (raw !== null) {
-      const parsed = JSON.parse(raw) as unknown
-      // Seed the uid counter past the persisted ids (it resets on reload);
-      // sanitize re-ids any duplicates the pre-seeding counter left behind.
-      nextIdCounter = maxCounterId(parsed)
-      const sanitized = sanitizeState(parsed)
-      if (sanitized !== undefined) {
-        return globalWidth === undefined ? sanitized : { ...sanitized, width: globalWidth }
+  const globalWidth = reset ? undefined : readGlobalWidth()
+  if (!reset) {
+    try {
+      const raw = localStorage.getItem(`${STORAGE_PREFIX}:${sessionId}`)
+      if (raw !== null) {
+        const parsed = JSON.parse(raw) as unknown
+        // Seed the uid counter past the persisted ids (it resets on reload);
+        // sanitize re-ids any duplicates the pre-seeding counter left behind.
+        nextIdCounter = maxCounterId(parsed)
+        const sanitized = sanitizeState(parsed)
+        if (sanitized !== undefined) {
+          return globalWidth === undefined ? sanitized : { ...sanitized, width: globalWidth }
+        }
       }
+    } catch {
+      // Corrupt or unavailable storage: fall through to the default.
     }
-  } catch {
-    // Corrupt or unavailable storage: fall through to the default.
   }
   // New sessions seed from the user's side card prefs: the width is the
   // chosen percent of the window (clamped to the panel floor and the