Polish academic and CAS UI, fix KSP plugin resolution

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Summary

This PR improves the Academic and CAS screens and fixes CI plugin resolution for KSP.

Changes

• redesign the Academic screen layout
• make subject cards more readable with per-subject color treatment
• split term scores into clearer blocks instead of crowded inline chips
• reduce header / top spacing and tighten the term selector card layout
• add a search field to CAS Browse for easier club lookup
• keep CAS search state in UI state and filter loaded clubs locally
• continue loading browse pages while searching so clubs on later pages are still discoverable
• fix Gradle KSP plugin resolution in CI by resolving the plugin module explicitly in settings.gradle.kts
• prioritize official plugin repositories before mirror repositories for plugin resolution

Verification

• ./gradlew :app:compileDebugKotlin

Notes

The previous PR failed during CI because the KSP Gradle plugin marker could not be resolved from the configured plugin repositories. This PR includes a repository / plugin
resolution fix for that issue.

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The failing check is still running with Gradle 8.9, which is incompatible with the current project AGP version (8.13.2).

I already updated the workflow in this branch to use the repository Gradle wrapper instead of forcing Gradle 8.9, but the PR check still appears to be using the old CI
configuration from the base branch.

According to the Android Gradle Plugin compatibility table, AGP 8.13 requires Gradle 8.13 or newer:
https://developer.android.com/build/releases/gradle-plugin?from_column=20423

So this failure is caused by the upstream CI configuration still resolving Gradle 8.9, rather than by the code changes in this PR.