[bubulux]

Follow-up to #275, asked for while reviewing staging.

What changed

The timeline could edit only a clip's own layers. The sequence-wide layers belong to the shot, and reaching them meant opening the shot's Compose stage.

• Sequence layers button in a block's Sequence section, and Shift+C on any photo clip: the shot's layers open inline on the timeline stage, like Re-frame and Layers.
• Same list and settings as the Compose stage: footage row, + Drawing / + Adjustment (frame-anchored, every step), order, opacity, anchoring, look, drawing on the stage.
• Shows on offers Every step, and This step when the clip shows a stored step. Picking single steps stays in the Compose stage.
• Saves go to the shot. Every clip of the shot updates at once, and the bakery re-bakes for the phone.
• The tool is in the URL (?tool=shot-layers), like the other inline tools. Shortcuts doc regenerated; timeline and composition docs updated.

Checked

• make check green.
• Headless Chrome on a local database: Shift+C opens the panel with the migrated layers, adding an adjustment layer saves it to the shot, and exposure −3 darkens the stage and the strip thumb at once.

Not clicked through

• Drawing on a shot layer from the timeline, This step, deleting.
• Two editors of the same shot open at once (Compose stage and timeline) don't refresh each other's list until reopened.

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