[Bug]: vertical tab bar expand off screen while using right to left languages

[RoraHarvest]

Pre-Submission Checklist

• I have checked the existing/closed issues to ensure this issue has not already been reported.
• I am using the latest supported version of the browser.
• I have tried disabling all browser extensions/add-ons to rule out interference from these.
• I have tried clearing the browser cache and cookies.
• I have checked with a new profile and the issue still occurs.
• I have provided detailed step-by-step instructions on how to reproduce the issue.
• I have included relevant screenshots or console outputs.
• I have checked that this problem is not occurring in the latest version of Firefox ESR.
• This issue is specific to this browser and does not occur in other browsers.

Bug Summary

when the browser language is Hebrew or arabic, the vertical tab bar expand into an off screen zone instead of into the window. changing the language back to English solves it

Reproduction Steps

1. open floorp
2. navigate to the language setting and switch to a right to left language for the browser setting (Hebrew or arabic)
3. activate the "collapse vertical tab setting"
4. hover above the tab

Expected Behavior

the vertical bar expand fully into the window area

Actual Behavior

the bar expand into a zone off screen, making it unusuable

Screenshots

floorp.vertical.bar.bug.mp4

Browser Version

11.24.0

Operating System

fedora kde 41

Additional Context

No response