Release v3.6.2: OTA reliability fixes + WebUI live radar enhancements

Fixes title overflow on error/confirmation screens, adds diagnostic
serial logging to both the update check and download/flash steps,
pauses the background NetTask during OTA to avoid WiFi/TLS
contention (likely cause of intermittent failures), and reminds
users to close the WebUI page before updating since it polls the
device.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

index.html

@@ -112,7 +112,7 @@
 <div class="container">
     <h1>EISWOLFS FLIGHTRADAR CYD</h1>
     <div class="subtitle">Firmware Flash Utility</div>
-    <div class="version-badge">Version: v3.6.1</div>
+    <div class="version-badge">Version: v3.6.2</div>
 
     <p>Install the latest Flightradar firmware directly from your browser to your Cheap Yellow Display.</p>
 

src/config.h

@@ -6,7 +6,7 @@ namespace Config {
     // CLAUDE.md-Workflow "Standard-Workflow: Push & Release") - erscheint
     // im Info-Screen (Menue > System > Info) und muss zum jeweiligen
     // Git-Tag passen.
-    constexpr const char* APP_VERSION = "3.6.1";
+    constexpr const char* APP_VERSION = "3.6.2";
 
     // Display-Helligkeit (Menue > System > Helligkeit), in Prozent.
     // MIN bewusst nicht 0 - ein komplett dunkles Display koennte sonst wie