### Fullscreen focus mode (desktop + webapp)
- Added a top-right expand icon on every prompt editor that opens a
"Prompt" focus-mode overlay (blurred backdrop, `max-w-4xl` centered
card) for more prompting space.
- Same editor state — overlay binds to the same value + onChange, so
text/@-mentions persist. Auto-focuses with the caret at the end on open.
- Editor fills full height; @-mention dropdown no longer clipped; closes
on Esc / backdrop click.
- Reused `@storyteller/ui-modal`; shared `PromptFullscreenModal` +
button + `useFullscreenPrompt` hook across all 5 desktop promptboxes,
mirrored in the webapp's own PromptBox.
### 3D editor
- Model selector now renders inside the promptbox (was standalone on the
canvas).
- Pose button hides on deselect; pressing "Done" keeps it (flips back to
"Enter Pose Mode") while the character is still selected.
- Drag and drop into folders fix within gallery modal - doesn't close
immediately unless on 3D editor page.
### Tooltips & expand
- Fixed top-left menu tooltips getting stuck open after a tab change.
- Reworked image promptbox auto-grow/expand into a shared
`useAutoGrowEditorHeight` hook (no per-render style writes) with a
smooth height transition.
Tanish Manku
BFlat
Brandon Thomas