feat(settings): data-safe editors, deep-linked search, Data/About/Cost pages

- EditorModal loads once per path (a parent re-render no longer reloads the
  file over the user's typing), refuses Save after a failed load, opens a
  truncated (>256 KB) file read-only, and asks before overwriting a file
  that changed on disk or could not be re-read.
- Settings/Hooks editors unset only keys from the snapshot taken at Edit,
  warn when the file changed underneath, keep a renamed key's value, and
  refuse a new key named like a redacted one (env) or a read-only hook
  event, which used to replace the secret/hooks.
- Project scope shows its resolved folder and is disabled inside the
  plugin cache. Account-profile, pricing-row and pet deletes confirm;
  two-click actions disarm after 3 s; unsaved drafts ask before closing.
- Search indexes every Claude Code / Codex sub-tab, opens it via ?tab= and
  scrolls to + highlights the row; the active config tab is in the URL.
- General splits into General / Data / About; Pricing moves to a Cost
  group with one shared load; config tabs group as Content / Extensions /
  Config with arrow-key roving; Promise.allSettled per tab.
- Data: browser-preferences export/import (allowlisted keys), per-section
  reset, housekeeping dry-run first, clear-all behind a typed phrase.
  Server: purge days must be a whole number >= 1 (INVALID_PURGE_DAYS) and
  dry_run returns exactly what the real run would delete.
- Alerts can be edited; webhooks/alerts/remote-source failures toast;
  copies go through copyText; modals get dialog roles and useDialog.
- Sagi: Ctrl/Cmd+B only when shown and not typing, default spot clear of
  row controls, arrow keys move it, reduced motion honoured; the dead
  /run launch link goes to the workspace.

client/src/components/config/ConfirmDeleteModal.tsx

@@ -6,7 +6,8 @@
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useRef, useState } from "react";
+import { useDialog } from "../../hooks/useDialog";
 import { useTranslation } from "react-i18next";
 import { ShieldAlert, Trash2 } from "lucide-react";
 import type { CcArtifactType } from "../../lib/api";
@@ -41,13 +42,10 @@ export function ConfirmDeleteModal<
   const { t } = useTranslation("ccConfig");
   const [busy, setBusy] = useState(false);
 
-  useEffect(() => {
-    const onKey = (e: KeyboardEvent) => {
-      if (e.key === "Escape") onCancel();
-    };
-    window.addEventListener("keydown", onKey);
-    return () => window.removeEventListener("keydown", onKey);
-  }, [onCancel]);
+  const panelRef = useRef<HTMLDivElement>(null);
+  const cancelRef = useRef<HTMLButtonElement>(null);
+  // Focus starts on Cancel — the safe answer — and Escape cancels.
+  useDialog(true, panelRef, busy ? undefined : onCancel, cancelRef);
 
   const handleConfirm = useCallback(async () => {
     setBusy(true);
@@ -60,27 +58,36 @@ export function ConfirmDeleteModal<
 
   return (
     <div
-      className="fixed inset-0 bg-black/60 z-40 flex items-center justify-center p-4"
-      onClick={onCancel}
+      className="fixed inset-0 bg-surface-0/70 z-50 flex items-center justify-center p-4"
+      onClick={busy ? undefined : onCancel}
     >
       <div
+        ref={panelRef}
+        role="alertdialog"
+        aria-modal="true"
+        aria-labelledby="cc-confirm-delete-title"
+        aria-describedby="cc-confirm-delete-body"
         className="relative w-full max-w-lg rounded-xl border border-status-danger/40 bg-surface-1"
         onClick={(e) => e.stopPropagation()}
       >
         <div className="border-b border-border px-4 py-2.5 flex items-center gap-2">
           <ShieldAlert className="w-4 h-4 text-status-danger" />
-          <span className="text-sm font-medium text-fg-primary flex-1">
+          <span id="cc-confirm-delete-title" className="text-sm font-medium text-fg-primary flex-1">
             {t("edit.confirmDelete")}
           </span>
         </div>
         <div className="p-4 space-y-3">
-          <p className="text-xs text-fg-secondary leading-relaxed">{t("edit.confirmDeleteBody")}</p>
+          <p id="cc-confirm-delete-body" className="text-xs text-fg-secondary leading-relaxed">
+            {t("edit.confirmDeleteBody")}
+          </p>
           <div className="rounded-md border border-border bg-surface-2 px-3 py-2 font-mono text-[11px] text-fg-secondary break-all">
             {t("edit.confirmDeletePath", { path: state.path })}
           </div>
         </div>
         <div className="border-t border-border px-4 py-3 flex items-center justify-end gap-2">
           <button
+            ref={cancelRef}
+            type="button"
             onClick={onCancel}
             disabled={busy}
             className="text-[12px] font-medium px-3 py-1.5 rounded-md border border-border bg-surface-2 hover:bg-surface-3 text-fg-secondary disabled:opacity-60"
@@ -88,6 +95,7 @@ export function ConfirmDeleteModal<
             {t("edit.cancel")}
           </button>
           <button
+            type="button"
             onClick={handleConfirm}
             disabled={busy}
             className="text-[12px] font-medium px-3 py-1.5 rounded-md border border-status-danger/50 bg-status-danger/15 hover:bg-status-danger/25 text-status-danger inline-flex items-center gap-1.5 disabled:opacity-60"