* feat(issues): add sticky setting for the issue comment bar (MUL-4435)
The bottom comment composer can now pin itself to the scroll viewport so
it stays reachable while reading a long timeline. A pin toggle on the bar
itself persists the preference (default: on) via a new localStorage-backed
useCommentComposerStore. While pinned, the editor area is height-capped so
long drafts scroll internally instead of covering the timeline.
Co-authored-by: multica-agent <github@multica.ai>
* refactor(settings): move the sticky comment bar toggle to Settings > Preferences (MUL-4435)
Per review feedback: pinning the comment bar is a low-frequency choice, so
the toggle moves off the bar itself into Settings > Preferences as a Switch
row. The composer keeps reading the store for the sticky behavior and the
40vh editor cap; the pin button and its issues-locale tooltips are removed.
Co-authored-by: multica-agent <github@multica.ai>
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Co-authored-by: Lambda <lambda@multica.ai>
Co-authored-by: multica-agent <github@multica.ai>