fix: restore readable text in PRCreateModal branch dropdowns on dark theme

[R-Hart80]

Problem

Closes #204.

In PRCreateModal, the From and Into branch <select> elements had bg-transparent with no explicit text-* color. In dark mode, the inherited text color (near-white) rendered white-on-white against the browser's default white dropdown background. Both the selected value and the popup options were unreadable.

Fix

Two small additions to both dropdowns (components/pr/PRCreateModal.tsx):

1. <select> — added text-slate-900 dark:text-white so the selected branch label is always readable regardless of theme.
2. <option> — added className="bg-white text-slate-900 dark:bg-slate-700 dark:text-white" so the native dropdown popup respects the active theme.

Same change applied to both the From (line ~118) and Into (line ~140) dropdowns.

Testing

• Dark theme: selected branch label is readable in both dropdowns
• Dark theme: dropdown popup options are readable
• Light theme: no regression — dropdowns continue to render correctly
• 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

Plan: Pro

Run ID: 9b5ea668-9189-42d7-8af6-71b42e67594b

📥 Commits

Reviewing files that changed from the base of the PR and between 0233a83 and 5896f0b.

📒 Files selected for processing (2)

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

✨ Finishing Touches

🧪 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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