Fix system prune result summary

[mkaltner]

Summary

• report build-cache-only prune results as pruned resources
• fall back to a positive prune summary when reclaimed bytes are reported without deleted item lists
• add focused unit coverage for build cache, bytes-only, and empty-result summaries

iOS comparison

• iOS correctly summarizes non-empty container/image/volume/network prune arrays
• iOS has a nearby edge case where build-cache-only or bytes-only results can read as "Nothing to remove" while still showing freed bytes
• this Android fix preserves the normal item-count summary and handles that edge case explicitly

Test plan

• ANDROID_HOME=/home/nameless1/Android/Sdk ANDROID_SDK_ROOT=/home/nameless1/Android/Sdk ./gradlew --no-daemon :app:testDebugUnitTest :app:assembleDebug

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Greptile Summary

This PR fixes how system prune results are summarized in the Android dashboard. The main changes are:

• Reports build-cache-only prune results as pruned resources.
• Uses reclaimed bytes to show a positive summary when deleted item lists are empty.
• Adds focused unit tests for build cache, bytes-only, and empty prune results.

Confidence Score: 5/5

Safe to merge with minimal risk.

The change is narrowly scoped to prune result formatting and includes tests for the new edge cases. No functional or security issues were identified.

No files require special attention.

T-Rex Logs

What T-Rex did

• The dashboard prune prereq checks were reviewed and showed missing Java-related setup (no java command, empty JAVA_HOME, and missing Android SDK path).
• The focused dashboard prune test failed with exit code 1, and Gradle reported that JAVA_HOME is not set and no 'java' command could be found in PATH.

_{Ran code and verified through T-Rex}

_{Reviews (1): Last reviewed commit: "Fix system prune result summary" | Re-trigger Greptile}