Search mode filters tiles by substring on app name + window title;
return commits the filter, esc / Cancel clears it. Snapshot resolution
now scales with the tile's on-screen footprint (live capture unchanged)
so dense grids stay light while sparse grids look noticeably sharper.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Return picks the highlighted tile, esc / Done commits the filter
(rename from Cancel matches the new behaviour), and the cardinal arrow
keys move the tile selection instead of the caret. Swallow all caret-
movement selectors so the cursor never moves inside the field.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

The Swift-async overload of captureImage force-unwraps the bridged
CGImage?, so a (nil, nil) reply from ScreenCaptureKit traps the process.
Wrap the completion-handler form in a continuation and surface a thrown
error instead, letting the existing catch log and skip the snapshot.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ScreenCaptureKit can stop a stream on its own (window minimised, source
app suspended, replayd churn, backpressure) without us recovering. The
tile was left holding a recycled IOSurface and the live preview went
dead until the overlay was re-shown.

Recover by clearing the dead stream, promoting the last pixel buffer to
a stable CGImage so the tile keeps a valid image, and rescheduling
start() with a linear backoff up to six attempts. The retry counter
resets whenever a fresh frame arrives.

Add structured logging for every transition and a per-stream watchdog so
we can tell the difference between "stream stopped", "stream alive but
only emitting idle/blank/suspended", and "stream alive, complete frames
flowing but the layer never updates". Errors are formatted with their
NSError domain/code/underlying so the cause is visible in /tmp/cmdcmd.log.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

beginZoom drove layer.frame from the small grid cell to a near-fullsize
target while shadowPath snapped to the destination size at t=0, so the
blue accent shadow extended to the final dimensions before the tile had
moved — reading as a phantom halo. CALayer does not return a default
action for shadowPath, so removing the disable-actions wrapper alone
wasn't enough; the path is now driven by an explicit CABasicAnimation
that mirrors the active transaction's duration and timing function.

While peeked, the selected tile's accent border and blue glow are also
faded to zero (and restored on endZoom) so the highlight doesn't
overwhelm the near-fullscreen preview.

Also silence the unused-result warning on FileHandle.seekToEnd in Log.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>