Warning fixes

[UnknownJoe796]

All compiler warnings across the entire project are now resolved. Summary:

Scope: library, library-camera, library-lottie, test-utilities, example-app, gradle-plugin, ai-driver-server — main and test sources, across JVM, JVM/SSR,
JS, and Android targets. 141 files touched.

Real bugs found and fixed along the way:

• ImageView.kt had an actual compile error (missing public in explicit-API mode) — fixed first so anything could build.
• Navigator.navigateUrlLikePath/resetUrlLikePath silently swallowed invalid routes (always returned Unit); now return Boolean so AiDriver.kt can detect and
  report bad routes.
• KiteUiCss.kt: theme's transform reset to none was never emitted for elements whose transform changed to null, because the generic diff helper can't
  distinguish "unchanged" from "changed to null" — fixed with an explicit comparison. (This is why 2 golden SSR snapshot tests needed regenerating — the fix
  now correctly emits transform:none.)
• Removed ~900 lines of dead/no-op code: 598 redundant .toString() calls in a generated JS/SSR file, ~300 @ViewDsl/@ViewModifierDsl3 annotations that had
  no effect (the marker already lives on the Element/ElementWriter interfaces), unreachable else branches on exhaustive whens, tautological conditions in
  gradle-plugin.
• Corrected two @deprecated messages in the library pointing at a nonexistent renderListSlowIn API — the real replacement
  (renderListInExpensive/colOfExpensive/rowOfExpensive) already existed, just mis-named in the message.
• Build config: kotlinx.cinterop opt-ins were leaking from a shared compilerOptions block onto every non-native target (JVM/JS/Android), causing
  "unresolved opt-in marker" warnings everywhere — rescoped to native targets only, across 5 modules.

Two things I flagged and you decided on:

• ReactiveThreadCheck no longer exists in your reactive library — removed the Android/iOS thread-confinement guard that depended on it (per your choice).
• The renderListInExpensive/renderReorderableListIn container-factory API can't apply extra modifiers (weight/scrolling/theme/sizing) before the container
  it creates — for those call sites I kept the internal forEach/forEachAnimated with explicit @OptIn/@Suppress, documented inline. Worth a real fix later if
  you want modifier-preserving list helpers.

Verification: every module's main + test sources compile warning-free on JVM/JVMSsr/JS/Android, and the full test suite (including the SSR golden-snapshot
tests) passes.