Broaden Android accessibility autofill fallback

docs/android-autofill.md

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+# Android Autofill
+
+## App Target Matching
+
+User story:
+
+- When an entry carries an Android-specific target such as
+  `androidapp://com.blinknetwork.mobile2`, KeePassGO should treat that as a
+  first-class autofill target on Android.
+- If an exact app target exists, Android autofill should resolve that entry
+  directly instead of falling back to a generic chooser for the whole cache.
+
+Expected behavior:
+
+- `AndroidApp*` custom fields exported into the autofill cache must match the
+  Android package target used by the autofill and accessibility services.
+- The Android-side matcher must normalize `androidapp://...` targets the same
+  way the Go cache builder does.
+- The chooser path should still collapse to a single direct result when there
+  is one exact app-target match.
+
+## Accessibility Fallback
+
+User story:
+
+- When Android accessibility fallback is needed, KeePassGO should not be
+  limited to Chrome-only URL bar parsing.
+- Apps with stable package identities should still be fillable when an entry
+  carries a matching `AndroidApp*` target.
+
+Expected behavior:
+
+- Accessibility fallback derives its match target from the web domain when one
+  is available.
+- If no web domain is available, accessibility fallback uses the active app
+  package as `androidapp://<package>`.
+- The fallback path can therefore fill supported apps that never expose a
+  browser-style URL bar.