Reload Footage shows new pixels and keeps Photoshop layers; Reload Footage Changed on Disk

Reload Footage (Cmd+Alt+L) updated an item's metadata but left the media
pool's decoded frames and the layer cache in place, so the old image kept
rendering until Edit > Purge. It also replaced the footage with a probe of
the merged document, so a Photoshop layer item lost its layer and its
Retain Layer Sizes bounds.

Reload now re-reads only what the file decides (size, a movie's duration,
streams and frame rate, codec, a data file's text), keeps the layer or
page and the interpretation, finds a Photoshop layer again by name, and
makes the media layer forget the file (FootageSource::forget, which also
drops the EXR aux-channel cache) and clears the layer cache.

Settings > Import > Reload Footage Changed on Disk (on by default): the
desktop app stamps footage files (size + modification time) on a worker
thread every two seconds and when the window comes back to the front, and
reloads what changed. Not an undo step and it doesn't modify the project;
a file still being written is retried on the next check.
footage.reloadChanged runs one check (CLI, MCP, agents).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/preferences.md

@@ -109,6 +109,13 @@ Commands (CLI, MCP, control channel):
 - `type.fontNamesInEnglish`: off, fonts with a native-language family name show it
 - `import.reportMissingFrames`: gaps in an image sequence's numbering are reported on import
   (they show as colour-bar placeholders, as in After Effects; see [footage.md](footage.md))
+- `import.reloadChangedFootage`: Reload Footage Changed on Disk (on by default). Every two seconds,
+  and as soon as the window comes back to the front, the desktop app compares each footage file's
+  size and modification time with what they were, and reloads what another app saved: a
+  Photoshop file edited in PhotoCraft or Photoshop shows its new pixels without File ▸ Reload
+  Footage. It is not an undo step and doesn't modify the project; a layer item stays on its layer
+  (found again by name), and a file still being written is tried again on the next check.
+  `footage.reloadChanged` runs the same check once (CLI, agents)
 - `import.unlabeledAlpha`: alpha of TGA / TIFF / movie footage (Ask opens Interpret Footage;
   Guess takes premultiplied for movies, straight for stills)
 - `import.dragImportAs`: layered files dropped on the window import as footage or a comp