Progress: "Completed today" counts closures instead of merges; metrics use inconsistent time dimensions

[FourWindff]

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Progress Panel: "Completed today" counts closures instead of merges;
metrics use inconsistent time dimensions

Bug: "Completed today" increments on any close, not just completed work

Reproduction steps:

1. Create a new task, make no changes, and click Close.
2. The "Completed today" counter in the sidebar increments from 0
   to 1.

Root cause:

recordTaskCompleted() is invoked unconditionally inside
removeTaskFromStore() (src/store/tasks.ts:504). removeTaskFromStore
is reached from multiple paths, including:

• Normal close (closeTask) — covers empty tasks, unmerged tasks, etc. - Coordinator subtask closure (MCP_TaskClosed)

Expected: "Completed today" should only count tasks that were successfully merged into main/master today.

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Design issue: The two metrics use different time dimensions

The current Progress panel shows:

• Completed today — resets daily
• Merged to main/master — global cumulative total

Problems:

1. Semantic mismatch: Presented side-by-side, both numbers appear to
   be "today's" metrics, but Merged is actually a lifetime total.
2. Readability decay: Over time, numbers like +15,000 / -3,200 become
   unwieldy and lose meaning as a daily progress indicator.
3. Unclear purpose: Is Progress meant to show "what I did today" or
   "my total historical output"?

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Proposal: Unify Progress as a "Today's Work" panel

Fix Completed today:

• Rename to Merged today and only count tasks successfully merged
  today.
• Increment inside mergeTask when cleanup=true; remove the
  unconditional call from removeTaskFromStore.

Update Merged to main/master:

• Switch to a daily tally to match the time dimension of Merged
  today.
• Show today's +added / -removed.

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Future enhancement: Activity calendar (Contribution Graph)

The value of Progress is helping users feel their daily rhythm. The
current two-card layout is low-density. A small contribution
calendar—similar to GitHub's profile graph or Claude Code Stats—would
make daily activity much more tangible.