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/ToastNotice.tsx

@@ -1,46 +1,18 @@
 /**
  * @file ToastNotice.tsx
- * @description Bottom-right success/error toast for the config explorer.
- * Tool-agnostic — the page owns the 5s auto-dismiss timer and passes the
- * message down.
+ * @description The config explorers' `{kind, message}` toast shape and
+ * `showToast`, which hands it to the app-wide toast queue (`lib/toast.ts`): a
+ * success fades on its own, an error stays until dismissed. The panels keep
+ * taking an `onToast(Toast)` prop, so this is the one place it is rendered.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
-import { AlertCircle, Check, X } from "lucide-react";
+import { toast } from "../../lib/toast";
 
 export type Toast = { kind: "success" | "error"; message: string } | null;
 
-export function ToastNotice({
-  toast,
-  onDismiss,
-}: {
-  toast: NonNullable<Toast>;
-  onDismiss: () => void;
-}) {
-  const isErr = toast.kind === "error";
-  return (
-    <div className="fixed bottom-6 right-6 z-50 max-w-md">
-      <div
-        className={`rounded-lg border px-3 py-2 shadow-lg flex items-start gap-2 ${
-          isErr
-            ? "border-status-danger/50 bg-status-danger/15 text-status-danger"
-            : "border-status-success/40 bg-status-success/10 text-status-success"
-        }`}
-      >
-        {isErr ? (
-          <AlertCircle className="w-4 h-4 flex-shrink-0 mt-0.5" />
-        ) : (
-          <Check className="w-4 h-4 flex-shrink-0 mt-0.5" />
-        )}
-        <span className="text-xs leading-relaxed flex-1 break-all">{toast.message}</span>
-        <button
-          onClick={onDismiss}
-          className="text-current/70 hover:text-current p-0.5"
-          aria-label="dismiss"
-        >
-          <X className="w-3 h-3" />
-        </button>
-      </div>
-    </div>
-  );
+/** Show a config-page toast through the global queue. */
+export function showToast(t: NonNullable<Toast>): void {
+  if (t.kind === "error") toast.error(t.message);
+  else toast.success(t.message);
 }