rename: Android is Inkwell — package, applicationId, uniffi class, assets

Step 4 of milestone 481 (Scribe note 5071: a full rename).

- namespace and applicationId com.fabledsword.inkwell; the Kotlin package moves
  with them, and ktlint re-sorted the imports the rename reordered (checked
  locally with CI's ktlint 1.4.0 and detekt 1.23.7, both clean)
- uniffi: class Inkwell in com.fabledsword.inkwell.core, InkwellApplication,
  InkwellTheme, Theme.Inkwell, log tags, prefs and work names, client agent
  inkwell-android
- the lane publishes inkwell.apk / inkwell-android.json; fetch-clients,
  guard-forward, publish-release and write-manifest read the same names

A new applicationId is a new app. The old ThoughtSync app keeps its own store
and stays installed beside it. Notes cross over by syncing, and the old app is
then removed by hand.

Kept: the signing keyAlias is still "thoughtsync". It names the key inside the
existing keystore, and the key, and so the certificate, are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

desktop/packaging/write-manifest.sh

@@ -229,7 +229,7 @@ if [ "${PRUNE_OLD_ASSETS:-false}" = "true" ]; then
         # every desktop push regardless. That is exactly what happened on run
         # 4098, which swept the APK run 4092 had just published.
         case "$asset_name" in
-          latest.json|inkwell-desktop.json|thoughtsync.apk|thoughtsync-android.json) continue ;;
+          latest.json|inkwell-desktop.json|inkwell.apk|inkwell-android.json) continue ;;
           *"$APP_VERSION"*) continue ;;
         esac
         echo "    removing $asset_name"