feat(lanes): show Add Lane auto-setup summary before closing modal

The three setup calls (profile/agents/mcp) fired after worktree
creation but their outcome was only logged to the console. Keep the
modal open with a ✓/✗ summary for a few seconds (or until dismissed)
so the user actually sees what happened, matching the original F5 design.

client/src/i18n/locales/en/lanes.json

@@ -23,6 +23,10 @@
   "addLaneNotARepo": "Not a git repository (or no read access) yet.",
   "addLaneRepoHint": "An existing git repo. The dashboard creates a new worktree for the lane, not a folder you pick.",
   "addLaneRepoLabel": "Source repository",
+  "addLaneSetupAgents": "Agents",
+  "addLaneSetupMcp": "MCP servers",
+  "addLaneSetupProfile": "Profile",
+  "addLaneSetupTitle": "Setup",
   "addLaneTitleLabel": "Title",
   "addLaneTitlePlaceholder": "Optional",
   "autoStage": "auto: {{stage}}",