v3.5.1: OTA download fix, reworked update result screens, timeout slider

Fixes OTA downloads (GitHub's asset redirect wasn't followed before,
so every download failed), reworks the update success/failure
screens to require explicit confirmation instead of auto-vanishing
or auto-restarting, and drops the release-asset rename step in favor
of just uploading firmware.bin directly.

Replaces the screen-timeout tap-cycling with a drag slider (1-15
minutes, then "Never"); the idle screensaver toggle moves into this
same screen since it only affects what happens when the timeout
fires.

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

README.md

@@ -59,8 +59,9 @@ You can flash the firmware directly from your browser to your CYD display withou
 - **Metric/Imperial units** (Menu → Region → "Units") consistently applied across the radar range button, range ring labels, aircraft list, nearest-airport distance, and stats
 - **About screen** (Menu → System → "About") shows the project name, a short description, and the current firmware version
 - **Backup & Reset** (Menu → System → "Backup & Reset") – back up or restore your settings, or fully reset the device (wipes all on-device data and re-runs first-time setup) - handy for testing or handing the device to someone else
-- **Idle screensaver** (Menu → System → "Screensaver", off by default) – after the inactivity timeout, shows a dimmed starfield with a large clock instead of turning the display off completely; a tap wakes it back up
+- **Screen timeout with slider** (Menu → System → "Screen Timeout") – set how long until the display turns off after a period of no touches, from 1 to 15 minutes or "Never", using a drag slider instead of tapping through values one minute at a time
-- **OTA firmware updates over WiFi** (Menu → System → "Check for update") – checks the latest GitHub release and, if newer, downloads and installs it directly on the device, no cable or web flasher needed
+- **Idle screensaver** (same screen, off by default) – instead of turning the display off completely after the timeout, shows a dimmed starfield with a large clock; a tap wakes it back up
+- **OTA firmware updates over WiFi** (Menu → System → "Check for update") – checks the latest GitHub release and, if newer, downloads and installs it directly on the device, no cable or web flasher needed. Update results are shown as a clear on-screen message that requires confirmation, with an explicit restart button on success
 
 ## Feature Deep-Dive
 

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: v3.5.0</div>
+    <div class="version-badge">Version: v3.5.1</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 = "3.5.0";
+    constexpr const char* APP_VERSION = "3.5.1";
 
     // Display-Helligkeit (Menue > System > Helligkeit), in Prozent.
     // MIN bewusst nicht 0 - ein komplett dunkles Display koennte sonst wie