Animations: a double-click keys what an empty row shows (#412)

A double-click into a timeline row without keys sets the value its
field shows, not the property's default (#412). Development names
2047 checks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Animations.md

@@ -111,7 +111,8 @@ Each row shows its **value at the playhead** on the right of its header, in the
 inspector uses for that kind (a number, a tick, a colour, a picture …). Before the row has keys
 it shows what the object holds, a relative row shows its offset. **Editing that field sets a key
 at the playhead** (or changes the one there) and picks it; while playing, it pauses first.
-**Double-click** a cell to set a key with the value that holds there (then edit the value in
+**Double-click** a cell to set a key with the value that holds there, on a row without keys
+the value its field shows (then edit the value in
 the row or in the inspector while the key is selected); click a key to pick it, drag a band to pick several,
 drag keys to move them (one landing on another replaces it), `Delete` removes the picked keys —
 or the whole row when its header is picked. `Ctrl`+drag duplicates keys: the originals stay, the

Development.md

@@ -21,7 +21,7 @@ php tests/php/releases.test.php                               # the release stor
 php tests/php/files.test.php                                  # uploaded files in a folder per account (#344), the same way
 php tests/php/videos.test.php                                 # the video store, its queue and the worker (#402), with the
                                                               #   real ffmpeg: the CI image and game-maker-video have it
-node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 2046 editor checks, screenshots in /tmp/gm-e2e-*.png
+node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 2047 editor checks, screenshots in /tmp/gm-e2e-*.png
 GM_STEPS=20 node tools/e2e.mjs                                # or 1-12, or 6,20 — a subset while working on one step
 ./e2e.sh start [GM_STEPS]                                     # the same run detached, see below
 ./e2e.sh status                                               # live progress, or the last run's result