[TimeToBuildBob]

What

Adds a real WebView instrumentation test for the rootless-document theme-hook failure fixed by #375. The JVM source-string assertion cannot show whether the hook actually survives document.documentElement === null.

The test loads an isolated fixture, removes its root, injects the production ANDROID_THEME_HOOK_JS, checks installation succeeded without reporting settlement, restores #app/#wrapper, and verifies the bridge receives the expected navigation token exactly once. More mutations and a repeated injection must not produce a second report. The WebView is destroyed in finally; no server, app preferences or permission changes are needed.

Dependency

Includes the existing #375 fix commit unchanged, followed by one test-only commit. Merge #375 first; after that this PR reduces to the instrumentation test. This does not edit the monitored #375 branch or add another production fix.

Verification

Executed on Bob's remote KVM Android 14 gptme-test emulator:

• RED, master 68947c0 plus new test: fails with TypeError: Failed to execute 'observe' on 'MutationObserver': parameter 1 is not of type 'Node'.
• GREEN, the same test plus fix(webview): keep the theme hook alive when the document has no root yet #375's 11c7f31: 1 test passed, BUILD SUCCESSFUL.
• Both runs used ./gradlew --no-daemon :mobile:connectedStandardDebugAndroidTest -Pandroid.testInstrumentationRunnerArguments.class=net.activitywatch.android.RootlessThemeHookTest.
• The existing make test-e2e-main includes this class automatically; no workflow change is needed. Full CI is pending, not claimed green.

This is behavioral regression coverage, not a claim that the separate native navigation-tag race is fixed. The fixture uses the light theme to isolate missing-root observation from stylesheet-loading behavior already covered by DashboardThemePaintTest.

[greptile-apps]

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge; no actionable issues were found.

Summary

Adds a real WebView regression test for installing ANDROID_THEME_HOOK_JS while the document has no root.

• The Android theme hook keeps watching until a rootless page gains its dashboard content.

TimeToBuildBob explicitly leaves the separate native navigation-tag race out of scope; this PR does not claim to fix it.

_{Reviews (1) · Last reviewed commit: "test(webview): execute theme hook while ..." · Reviewed by Greptile}

[TimeToBuildBob]

Greptile reviewed fd2d572 with no actionable findings (5/5); there are no inline review threads or unanswered human comments. CI is still running, so no rerun or code change is needed now. Merge remains maintainer-owned, with #375 to land first as described above.