## Summary
Rebased-on-behalf of @franksong2702 (originally PR #728 — had CHANGELOG conflict after #747 merged).
Moves `#cmdDropdown` from outside `composer-box` to inside it, so the `position:absolute` anchor is scoped to the composer width rather than the full chat panel. CSS updated to use `bottom:calc(100% + 4px)` and `width:auto;max-width:100%` for clean upward positioning.
Closes#633
## Changes
- `static/index.html` — moved `cmd-dropdown` div inside `composer-box`
- `static/style.css` — updated `.cmd-dropdown` positioning (remove `margin-bottom`, use `bottom:calc(100% + 4px)`, add `width:auto;max-width:100%`)
- `tests/test_sprint50.py` — 2 new structural tests verifying DOM position and CSS rules
## Tests
1493 passed, 1 warning (2 new tests added)
**Original author:** @franksong2702
