PR #16146 introduced a problem with selecting a different font as
display font so that we always ended up with not setting the font.
This was caused by the font filenames now being a URL (which is necessary
because they get processed by the web engine). However, the Android code
checks for the existence of the font in order to create the typeface,
which only works for local paths.
This PR modifies and simplifies `KMKeyboard.getFontFilename` to return the
full path, renames `KMKeyboard.txtFont` and `KMKeyboard.oskFont` to make
it clearer that they contain a path and not a URL.
Also initialize `KMKeyboard.oskFontPath` with empty string instead of
`null`. This makes it consistent with` txtFontPath` and with the
documented behavior of `KMManager.getKeyboardOskFontFilename()` (which
returns `KMKeyboard.oskFontPath`).
Follows: #16146Fixes: #16187
Build-bot: release:android
This change moves to using `WebViewAssetLoader` for loading files from
the device instead of using file:// URLs. This fixes the blank keyboard
problem reported in #16096 for Android.
Also make `KMKeyboard.getKeyboardRoot()` private, and rename public
`Keyboard.getKeyboardPath()` to private `Keyboard.getKeyboardUrl()`.
Part-of: #16096
This change updates the Android Target API to 36 to satisfy the upcoming
annual Play Store Aug 31 requirement. It updates Keyman for Android to
use API level 36 by changing the compileSdk and targetSdkVersion
properties to 36.
Also update `compileSdkVersion` and some reformatting in `README.md`.
Changes made by AI (Gemini 3 Flash Preview).
Fixes: #16279
Build-bot: release:android
Cherry-pick-of: #16280
Refactor mayPredictOverride so the banner toggle is handled independently for `KeyboardType.KEYBOARD_TYPE_INAPP` and `KeyboardType.KEYBOARD_TYPE_SYSTEM` keyboards.
Pre-existing override API calls are now for `KeyboardType.KEYBOARD_TYPE_SYSTEM`
# Keyman Conventional Commit suggestions:
#
# - Link to a Sentry issue with git trailer:
# Fixes: _MODULE_-_ID_
# - Give credit to co-authors:
# Co-authored-by: _Name_ <_email_>
# - Use imperative, present tense ('attach' not 'attaches', 'attached' etc)
# - Don't include a period at the end of the title
# - Always include a blank line before trailers
# - More: https://github.com/keymanapp/keyman/wiki/Pull-Request-and-Commit-workflow-notes
