Release LeanTypeDual 3.11.0

[AsafMah]

Summary

• Bump LeanTypeDual to 3.11.0 (versionCode 4100) after the LeanBitLab/LeanType v3.9.5 sync in merge: sync LeanBitLab v3.9.5 #118.
• Add dated changelog, Fastlane metadata, and release notes for direct IME switching, persistent custom layouts, suggestion controls, Java gesture improvements, Text Expander fixes, and dictionary hardening.
• Refresh the downloadable dictionary catalog to the current repository inventory and fix tools/release.py to read dictionary metadata as UTF-8 on Windows.
• Fix direct target-IME switching on Android 6–8 by routing through the legacy InputMethodManager APIs, with positive and null-token SDK-27 regressions.
• Keep ordinary lowercase words such as to, no, and meet lowercase when typing or swiping without Shift, while preserving I, acronyms, mixed-case words, and shifted/locked behavior.

Refs #119.

Verification completed

• ./gradlew.bat :app:assembleRelease --no-daemon --console=plain — all four variants build successfully.
• Focused offline-debug regressions pass: KeySpecParserTest, KeyboardStateTest, DirectImeSwitchTest, ImeCompatTest, SuggestTest, SwipeGestureEngineTest, DictionaryGroupTest, and SettingsContainerTest.
• Capitalization regression suites pass for exact tap/swipe samples, captured OFF/AUTO_SHIFTED/SHIFT_LOCKED modes, I/RJ/iPhone, live-converge behavior, leading punctuation, supplementary-plane letters, and Turkish dotted-I; broader runTests variants of SuggestTest, InputLogicTest, and StringUtilsTest pass.
• python -m unittest tools.test_release passes.
• GitHub Actions Unit tests run #29364972720 passes for commit fb071ffb8.
• All 276 dictionary catalog URLs were HEAD-checked: 145 emoji CLDR, 50 experimental, and 81 main; no failures.
• APK manifests report 3.11.0 / 4100, expected package IDs and minSdk values, and no INTERNET permission in Offline/Offline Lite.
• High-effort independent cross-model reviews completed. The pre-Android-9 direct-IME, null-token, tap/swipe capitalization, and first-letter Unicode findings were reproduced, fixed, and regression-tested; final assessments had no unresolved correctness blocker.

Hard release gates — do not merge/tag/publish yet

• Signing identity unavailable: the local keystore.properties contains placeholder credentials, and all four final APKs fail apksigner verify --verbose --print-certs with no release signature. Do not generate a replacement key; obtain the established LeanTypeDual release credentials, rebuild, and confirm the certificate fingerprint.
• Physical-device smoke unavailable: wireless ADB endpoints for both phone and tablet are offline. Signed APKs must be installed and exercised on both devices before merge/tag/publication.
• Translation refresh was not applied because Weblate returned a bot-challenge HTML payload instead of the ZIP.
• Khipro mapping refresh was not applied because the configured upstream touchscreen.json source has been retired (404); the checked-in mapping is unchanged.

Required device smoke

On both phone and tablet with a correctly signed Standard Full APK:

• Confirm upgrade install succeeds and settings/dictionaries are retained.
• Enable/select LeanTypeDual and type in a real editor.
• Verify direct IME switching with both an IME-only target and a target subtype.
• Verify a custom layout slot survives symbols mode, rotation, and keyboard reload.
• Toggle multi-word suggestion filtering and verify visible behavior.
• Verify to, no, and meet remain lowercase for both taps and swipes without Shift; verify shifted and locked gesture casing still produces title case and all caps.
• Re-run apksigner verify --verbose --print-certs on every release APK and compare the certificate SHA-256 to the established release identity.

After those gates pass: mark this PR ready, merge into dev, promote dev to main, tag v3.11.0, and publish the signed artifacts.