fix(ui): match dropdown and composer backgrounds

[RestartFU]

Summary

• replace blue-tinted dropdown surfaces with the composer surface tone
• apply the same tone to native and custom popovers
• keep dropdown backgrounds solid so underlying content cannot shift their color

Testing

• make test (20/20 passed)

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 81e510fd-afe4-408d-b1c9-88770e9599e3

📥 Commits

Reviewing files that changed from the base of the PR and between 50ec2e7 and 0694410.

📒 Files selected for processing (1)

• src/xd-app.c

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch xd/dropdown-background-color-should-be-the-same-or-124383b7

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