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/settings/ClaudeAgentHubSettings.tsx

@@ -4,7 +4,7 @@
  * under Settings → Claude Code → Overview: the CLAUDE_HOME the server reads
  * transcripts and config from, the AgentHub hooks installed into Claude Code
  * with a Reinstall button, and Model Pricing for Claude models (the shared
- * `PricingSettings` table, with Reset Defaults).
+ * `PricingSettings` table, with Reset Defaults). Changing CLAUDE_HOME asks first.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
@@ -128,8 +128,9 @@ export function ClaudeAgentHubSettings({ onHomeChanged }: { onHomeChanged?: () =
         id="claude-home"
         title={t("claudeHome.title")}
         description={t("claudeHome.description")}
-        note={t("cursorPathsNote")}
+        note={t("claudeHome.note")}
         placeholder={t("claudeHome.placeholder")}
+        confirm={{ title: t("claudeHome.confirmTitle"), message: t("claudeHome.confirmBody") }}
         load={() =>
           api.settings.claudeHome
             .get()