feat(studio): MCP suggestions + Approvals/Audit/Settings i18n (v0.26.0)

- Add curated catalogue of 9 official Anthropic MCP servers as
  click-to-prefill chips in the Add-MCP-server dialog. Operator
  still confirms via "Add + discover"; nothing is auto-spawned,
  preserving the regulated-environment trust model.
- Localize Approvals page: pending/history empty states, status
  pills, payload preview, approve/reject toasts, reject dialog,
  history detail dialog, expires-in pill.
- Localize Audit page: filter chips, clear-log dialog and toasts,
  no-events / hub-unreachable empty states, live-status bar with
  pluralized event count, hash-chain-verified badge, System AI
  panel (cached pill, latency, regenerate tooltip, asking
  state), event-detail dialog actions.
- Localize Settings dialog: hub-endpoint section, channel
  blurb + popup-menu items, System AI panel headers and
  off-blurb, MCP/N8N panel headers + pluralized counts +
  refresh/add/remove tooltips, Add-MCP and Add-n8n dialogs
  (intro, suggestions label, all field labels and hints, save
  buttons, toasts).

Field labels that map directly to JSON keys (event_id, flow,
step, module, provider, endpoint, model) stay English by design
— they're technical identifiers, not UI copy.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

pubspec.yaml

@@ -1,7 +1,7 @@
 name: fai_studio
 description: "F∆I Studio — desktop GUI for the F∆I hub"
 publish_to: 'none'
-version: 0.25.0
+version: 0.26.0
 
 environment:
   sdk: ^3.11.0-200.1.beta