fix(progress): gate merged-lines counter on cleanup

`mergeTask` already gated `recordTaskMerged()` on `cleanup === true` so
that only completed merge+cleanup lifecycles count toward "Merged today"
(the fix from issue #151). `recordMergedLines()` sat above the gate and
ran on every merge call regardless of cleanup, so the side-by-side
sidebar counters could drift out of sync:

- Merge without cleanup (e.g. "merge & keep") bumped the lines totals
  but not the merged-today counter.
- A later close via closeTask never bumps merged-today, so the task
  contributed lines but was never counted as a merged task.

Move the call inside the same `if (cleanup)` block so both stats share
one gate and one source-of-truth event.

Author: ASRagab

src/store/tasks.test.ts

@@ -152,7 +152,7 @@ import {
   updateTaskBranch,
 } from './tasks';
 import { getCoordinatorChildren } from './sidebar-order';
-import { recordTaskMerged } from './completion';
+import { recordMergedLines, recordTaskMerged } from './completion';
 import { markAgentSpawned, rescheduleTaskStatusPolling } from './taskStatus';
 import { saveState } from './persistence';
 import { getProjectBranchPrefix, getProjectPath, isProjectMissing } from './projects';
@@ -1116,9 +1116,11 @@ describe('recordTaskMerged counts merges with cleanup, not closures', () => {
     await mergeTask('task-1', { cleanup: true });
 
     expect(recordTaskMerged).toHaveBeenCalledTimes(1);
+    expect(recordMergedLines).toHaveBeenCalledTimes(1);
+    expect(recordMergedLines).toHaveBeenCalledWith(10, 2);
   });
 
-  it('merging without cleanup does NOT increment the counter', async () => {
+  it('merging without cleanup does NOT increment the counter or lines totals', async () => {
     mockTasks['task-1'] = {
       agentIds: [],
       shellAgentIds: [],
@@ -1138,6 +1140,7 @@ describe('recordTaskMerged counts merges with cleanup, not closures', () => {
     await mergeTask('task-1', { cleanup: false });
 
     expect(recordTaskMerged).not.toHaveBeenCalled();
+    expect(recordMergedLines).not.toHaveBeenCalled();
   });
 });
 

src/store/tasks.ts

@@ -589,9 +589,9 @@ export async function mergeTask(
     message: options?.message,
     cleanup,
   });
-  recordMergedLines(mergeResult.lines_added, mergeResult.lines_removed);
 
   if (cleanup) {
+    recordMergedLines(mergeResult.lines_added, mergeResult.lines_removed);
     recordTaskMerged();
     await Promise.allSettled(
       [...agentIds, ...shellAgentIds].map((id) => invoke(IPC.KillAgent, { agentId: id })),