fix: let BranchSelector dropdown grow to fit content

[R-Hart80]

Problem

Closes #205.

BranchSelector's dropdown menu was hard-coded at w-64 (256 px). Branch rows pack in a check icon, branch name, optional default badge, commit SHA, ahead/behind counters, and a trash button — so any moderately long branch name (e.g. feature/preserve-entity-selection) would overflow the container and expose a horizontal scrollbar.

Fix

One-line change in components/revision/BranchSelector.tsx (line 170):

- <div className="absolute right-0 top-full z-50 mt-1 w-64 rounded-md ...">
+ <div className="absolute right-0 top-full z-50 mt-1 w-max min-w-64 max-w-[32rem] rounded-md ...">

• w-max — menu grows to its widest row's intrinsic width, eliminating the horizontal scrollbar.
• min-w-64 — 256 px floor keeps the existing appearance for projects with only short branch names.
• max-w-[32rem] — 512 px ceiling prevents a single extremely long name from pushing the menu off-screen; the existing truncate on the branch-name span re-engages at that point.

The vertical scroll container (max-h-64 overflow-y-auto) is unchanged — that behaviour is correct.

Testing

• Short branch names only: menu width is unchanged from today (≥ 256 px)
• Moderately long name (e.g. feature/preserve-entity-selection): menu auto-grows, no horizontal scrollbar
• Very long name: menu caps at max-w-[32rem], branch name truncates
• Trigger button appearance unchanged
• Existing test suite: 158/159 pass (1 pre-existing failure in LanguagePicker.test.tsx, unrelated)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 45506724-811e-4822-b1e7-275954ad47c2

📥 Commits

Reviewing files that changed from the base of the PR and between 0233a83 and e4b4531.

📒 Files selected for processing (3)

• components/editor/shared/EntityTreeToolbar.tsx
• components/pr/PRCreateModal.tsx
• components/revision/BranchSelector.tsx

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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