feat(web): add tooltip for branch selector

[ivenuss]

What Changed

Added tooltip to the branch selector and title attribute for combobox items.

Why

Longer branch names are truncated, and it's hard to tell which branch is which when they have the same prefix.

UI Changes

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Low Risk
Presentation-only UX in the branch toolbar; no behavior, API, or data-path changes.

Overview
Truncated branch names in the toolbar and ref picker are now easier to read at a glance.

The branch selector trigger is wrapped in a tooltip that shows the full triggerLabel on hover, matching the pattern already used for the adjacent PR pill. Each ref row in the combobox list gets a native title attribute with the full ref name so truncated entries in the dropdown expose the complete string without opening anything else.

^{Reviewed by Cursor Bugbot for commit 08417c1. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add tooltip to branch selector trigger in toolbar

Wraps the branch selector trigger in BranchToolbarBranchSelector.tsx with a Tooltip that displays the full current branch name on hover. Also adds a native title attribute to each combobox item label so truncated branch names are readable without opening the dropdown.

^{Macroscope summarized 08417c1.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR adds tooltips to the branch selector so users can see full branch names when truncated. It's a simple UI enhancement using existing Tooltip components already present in the file, with no runtime behavior changes.

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