merge: sync LeanBitLab v3.9.9

[AsafMah]

Summary

Merge the pinned LeanBitLab/LeanType v3.9.9 release (adb7c3755) into LeanTypeDual without pulling the eight newer upstream/main commits that already belong to v4.0.0-beta1.

The update adds system-emoji and app-language settings, multi-row number rows, toolbar swipe-to-dismiss, translation and spellcheck improvements, asynchronous fallback-gesture indexing, dictionary upgrade preservation, and native dictionary crash/ANR fixes. LeanTypeDual's identity, privacy flavors, toolbar/two-thumb features, badges, screenshots, and Fastlane release history remain fork-owned.

Fixes #121.

Merge decisions

• Kept com.asafmah.leantypedual, version 3.10.0 / code 4000, compileSdk 36, and targetSdk 35.
• Combined upstream swipe-down dismissal with the fork's toolbar auto-show/hide and hardware-keyboard settings.
• Accepted the upstream fallback-gesture default and translation-language history resolution after auditing Mergiraf output.
• Removed an auto-merged duplicate AndroidX Startup provider while retaining both WorkManager and EmojiCompat initializer removals.
• Excluded LeanBitLab Fastlane changelogs, screenshots, and live badge assets; retained technical upstream release-note documents.

Reliability fixes found during integration

• Use APK asset / paths instead of host File.separator for dictionary upgrade/extraction, with red-to-green behavior coverage.
• Preserve upstream's legacy-first direct-IME switching order while making pre-Android-9 no-token paths safe no-ops; SDK-27 and modern direct-switch tests pass.
• Release main-dictionary load waiters in finally on failure.
• Make parallel multilingual suggestion workers snapshot-consistent, isolate mutable JNI weight arrays, omit/log failed secondary locales, and always release their latch; failure-path tests prove primary results return instead of hanging.
• Clear file-global InputLogic shadow-handler queues between scenarios to remove full-suite order leakage.

Verification

• All flavor gates pass: compileOfflineRunTestsKotlin, compileOfflineliteRunTestsKotlin, compileStandardRunTestsKotlin, and compileStandardfullRunTestsKotlin.
• Final full Offline debug suite: 294 tests, 11 failed, 1 skipped; failing names exactly match the origin/dev baseline (284 tests, 11 failed, 1 skipped). All ten added tests pass.
• Final Offline runTests suite: 294 tests, 4 failed, 1 skipped; the same four environment-dependent parser failures as the origin/dev baseline (284 tests, 4 failed, 1 skipped).
• Merged manifests retain the expected LeanTypeDual IDs and version, exactly one AndroidX Startup provider, and INTERNET only in Standard/Standard Full.
• High-effort independent review completed; its missing-final-suite evidence finding was resolved with the post-fix full debug run.
• GitHub Actions Unit tests run #29598368167 passes for merge commit 8cc6ebe62.

Known test-harness note

The merged full suites can print Robolectric DefaultDispatcher-worker teardown warnings without adding test failures. Temporary labeled handlers on both changed dictionary scopes caught no exception, and a RichInputMethodManager diagnostic changed teardown scheduling without reporting a scoped error. No diagnostic handlers are retained.

Release sequencing

Draft release PR #120 remains based on pre-v3.9.9 dev and separately changes ImeCompat, LatinIME, and Suggest. Merge this PR into dev first; then reconcile/update #120 so LeanTypeDual 3.11.0 contains v3.9.9 plus the verified lowercase suggestion fix without duplicating integration history.