Widget: target Android 16 (API 36) natively, no compatibility fallback

This is a single-user app, sideloaded onto exactly one phone, never
distributed broadly -- "what's the widest range of devices this should
install on" was the wrong question to ask about it. A prior pass
(2026-08-05) walked minSdk down to 31 on that reasoning, without
checking what device this actually runs on: Android 16 / API 36.

minSdk=targetSdk=compileSdk=36 now, matching the real device exactly.
Verified both directions on real emulator targets, not assumed:
installs and launches cleanly (no crash, target_sdk_version=36
confirmed via logcat) on a new dedicated API 36 AVD (doot_test_api36),
and correctly refuses to install on the existing API 34 emulator
(INSTALL_FAILED_OLDER_SDK) -- proving the constraint is real, not just
declared.

AGP 8.2.0's bundled D8 still warns "API level of 36 is not supported
by this compiler" even with build-tools;36.0.0 installed locally (AGP
doesn't delegate to the standalone SDK build-tools binary) -- confirmed
harmless via the install+launch verification above, not chased further
since a real fix means upgrading AGP itself, a bigger change than
justified here.

Audited the rest of the app for SDK-version fallback/polyfill code
that could now be simplified given the guaranteed floor: found none:
the only place minSdk mattered was this file.

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