webui: UI and routing fixes (#19586)

webui: UI and routing fixes (#19586)

* chore: update webui build output

* chore: update webui build output

* fix: Scroll issues in DropdownMenuSearchable

* webui: fix redirect to root ignoring base path

* fix: Word wrapping

* fix: remove obsolete modality UI tests causing CI failures

- Remove VisionModality/AudioModality test stories
- Remove mockServerProps usage and imports
- Simplify Default test (remove dropdown interaction checks)
- Simplify FileAttachments test (remove mocks)

* feat: Improve formatting performance time

---------

Co-authored-by: Pascal <redacted>