Support dark mode in Blaze WebViews

[nbradbury]

Fixes #21487

Previously Blaze web views would show with light mode colors even in dark mode. This PR addresses this.

To test:

• Enable dark mode either in the app or the device
• Tap the ☰ menu on the Blaze card
• Tap "Learn more"
• Tap "Blaze a post right now"
• Verify the WebView screen uses dark colors
• Disable dark mode and verify Blaze uses light colors

Note: Dark mode support is only available in Android 33 (Tiramisu) and above.

dark.mp4

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

Generated by 🚫 Danger

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21488-06aad70
	Commit	06aad70
	Direct Download	jetpack-prototype-build-pr21488-06aad70.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21488-06aad70
	Commit	06aad70
	Direct Download	wordpress-prototype-build-pr21488-06aad70.apk

Note: Google Login is not supported on these builds.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ApplicationNotResponding: ANR org.wordpress.android.ui.blaze.blazepromote.Bla... View Issue

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