Two related dashboard fixes.
1. Card timer mismatch: the board card timer chip showed only workflow
runtime (e.g. <1m on FN-2716) while the task detail Stats panel
reported "Total execution time" of 7m+ for the same task. Cause —
the slim board listing strips `task.log` to keep payloads small, so
the card's client-side `[timing]` log scan returned 0. Now the slim
path aggregates `[timing] … in <N>ms` durations server-side into a
new `task.timedExecutionMs` field before stripping the log; the
card prefers this aggregate, falling back to the client scan when
the full log is loaded (TaskDetailModal). Wire payload stays slim.
2. View Changes diff modal: defaulted to `90vw × 80vh` and was not
user-resizable. Switched to `min(95vw, 2200px) × min(90vh, ...)`
default with `resize: both`, persisted via useModalResizePersist
(`fusion:changes-diff-modal-size`). Mobile keeps fullscreen layout.
Overlay dismiss switched to the shared `useOverlayDismiss` hook so
resize-drags that release on the overlay don't close the modal.
Updated the diff modal's regression tests to match the new constraint
shape (still asserts max-height clamps to viewport via calc()).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
