Run prettier over the assistant files and the new dock unit test so the
web lint job passes, and remove the unused ASSISTANT_BUTTON_SIZE import
flagged by code quality review.
`shouldCollapseRail` was keyed on `!railExpanded`, mirroring the expand
helper instead of negating it. Once a hover revealed the button it could
never collapse back into the rail, so the collapse looked broken after the
first restore.
Key the predicate on `railExpanded` being true, restore the mirror
relationship with `shouldExpandRail`, and add regression coverage for the
expand -> leave -> collapse round trip. Also lengthen the rail strip.
Resolve conflicts in the workspace assistant integration:
- DynamicFormItemComponent: keep HEAD's compact model selector and
`disabled` field support while adopting master's `sortModelsByCatalog`
ordering and `MODEL_SELECT_TRIGGER_CLASS`.
- i18n (en-US, ja-JP, zh-Hans): keep both the `assistant` namespace from
HEAD and master's `sidebarGuide` / `pipelineMigration` additions.
Add 0030_merge_assistant to join the assistant conversations branch with
the released chain so the migration graph converges on a single head.
Rename it from 0030_merge_assistant_conversations to stay within the 32
character revision limit enforced by test_migrations.
Also add assistant button docking (long-press drag, edge collapse to a
short blue rail, hover restore) with pure helpers in assistant-dock.ts
and unit coverage, plus auto-collapse for finished tool result cards.
TyperBody