refactor(android): unify offline detection into NetworkStatusController

Absorbs VersionCheckController (/healthz poll + version parse) and
ServerHealthController (tri-state derive) into one signal-driven authority.
Adds the non-gating Unstable state across all ServerHealth branch sites
(OfflineGatedDataSource, SearchRepository, TrackRow, banner). Repoints
MinstrelApplication, MainActivity, PlayerFactory, VersionTooOldViewModel.
Drops the now-unused nowMs params the detekt UnusedParameter rule flagged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

android/.idea/caches/deviceStreaming.xml

@@ -1754,6 +1754,19 @@
           <option name="screenX" value="1600" />
           <option name="screenY" value="2560" />
         </PersistentDeviceSelectionData>
+        <PersistentDeviceSelectionData>
+          <option name="api" value="36" />
+          <option name="brand" value="google" />
+          <option name="codename" value="tangorpro" />
+          <option name="formFactor" value="Tablet" />
+          <option name="id" value="tangorpro" />
+          <option name="labId" value="google" />
+          <option name="manufacturer" value="Google" />
+          <option name="name" value="Pixel Tablet" />
+          <option name="screenDensity" value="320" />
+          <option name="screenX" value="1600" />
+          <option name="screenY" value="2560" />
+        </PersistentDeviceSelectionData>
         <PersistentDeviceSelectionData>
           <option name="api" value="35" />
           <option name="brand" value="google" />

android/.idea/misc.xml

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">