fix(ui): surface interactive/planning launch errors in footer

src/ClaudeDo.Localization/locales/en.json

@@ -88,6 +88,14 @@
       "inheritedFromGlobal": "inherited · Global",
       "overrideBadge": "override",
       "resetToInherited": "Reset to inherited"
+    },
+    "agentEditor": {
+      "model": "Model",
+      "maxTurns": "Max turns",
+      "systemPrompt": "System prompt (appended)",
+      "promptPrepended": "Prepended automatically:",
+      "agentFile": "Agent file",
+      "browse": "Browse..."
     }
   },
   "tasks": {
@@ -464,7 +472,7 @@
     "taskStatus": { "idle": "Idle", "queued": "Queued", "running": "Running", "waitingForReview": "Waiting for Review", "waitingForChildren": "Waiting for Improvements", "done": "Done", "failed": "Failed", "cancelled": "Cancelled", "parked": "Parked" },
     "planningBadge": { "active": "PLANNING", "finalized": "PLANNED" },
     "taskRow": { "createdPrefix": "Created {0}", "stepsText": "{0}/{1} steps" },
-    "tasksIsland": { "completedHeader": "COMPLETED", "completedHeaderCount": "COMPLETED · {0}" },
+    "tasksIsland": { "completedHeader": "COMPLETED", "completedHeaderCount": "COMPLETED · {0}", "runInteractiveFailed": "Run interactively failed: {0}", "planningOpenFailed": "Couldn't open planning session: {0}" },
     "diff": { "loadFailed": "Failed to load diff: {0}", "noChanges": "No changes to show.", "unavailable": "Diff no longer available — commit range incomplete." },
     "planningDiff": { "hubError": "Could not build combined preview (hub error).", "conflict": "Cannot build combined preview: subtask {0} conflicts with an earlier subtask ({1} files)." },
     "merge": { "commitMessage": "Merge task: {0}", "workerOfflineBranches": "Worker offline — cannot list branches.", "loadBranchesFailed": "Failed to load branches: {0}", "merged": "Merged.", "conflict": "Merge conflict — target branch restored. Resolve manually or via Continue, then retry.", "blocked": "Blocked: {0}", "unknownStatus": "Unknown status: {0}", "mergeFailed": "Merge failed: {0}" },