fix(worker,ui): clean up three review leftovers from the list-handler run

Remove the redundant TaskUpdated broadcast in TaskRunner.ContinueAsync's
queue-claim path, consolidate InteractiveLaunchSpecService's seven
MCP_TOOL_TIMEOUT literals into one constant (fixing the merge-helper handoff
spec's stale 200000ms value), and surface OpenQuickClaudeSession's two
failure cases via ErrorReported/footer instead of a silent no-op, with a
less ambiguous icon.

src/ClaudeDo.Worker/Runner/ClaudeProcess.cs

@@ -60,8 +60,8 @@ public sealed class ClaudeProcess : IClaudeProcess
         // wait_for_task_change blocks up to TaskWaitMcpTools.MaxTimeoutSeconds (900 s) and the
         // in-task AskUser tool blocks up to 3 min waiting for the user, so lift the cap well
         // past the longer of the two (with margin) or that wait would be killed early. Harmless
-        // for every other tool. Keep in sync with InteractiveLaunchSpecService's MCP_TOOL_TIMEOUT.
-        psi.Environment["MCP_TOOL_TIMEOUT"] = "930000";
+        // for every other tool. Shares the value with InteractiveLaunchSpecService.McpToolTimeoutMs.
+        psi.Environment["MCP_TOOL_TIMEOUT"] = InteractiveLaunchSpecService.McpToolTimeoutMs;
 
         using var process = new Process { StartInfo = psi };
         process.Start();