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>

android/app/src/main/AndroidManifest.xml

@@ -91,13 +91,13 @@
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 
     <application
-        android:name=".ThoughtSyncApplication"
+        android:name=".InkwellApplication"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/Theme.ThoughtSync"
+        android:theme="@style/Theme.Inkwell"
         android:usesCleartextTraffic="true">
         <!--
           launchMode="singleTop" exists for the SHARE filters below.
@@ -115,7 +115,7 @@
             android:exported="true"
             android:launchMode="singleTop"
             android:windowSoftInputMode="adjustResize"
-            android:theme="@style/Theme.ThoughtSync">
+            android:theme="@style/Theme.Inkwell">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />