Remove dead code (#11082)

Removed:
- MessageStore::addFromPacket and addFromString, superseded by
  tryAddFromPacket
- GeoCoord rangeRadiansToMeters, distanceTo, bearingTo
- Router::rawSend, declared virtual with no override and no caller
- ContentHandler handleHotspot, handleFs, handleAdminSettings,
  handleAdminSettingsApply, handleDeleteFsContent and their commented
  route registrations, plus the now unreachable htmlDeleteDir and the
  handleUpdateFs declaration that had no definition
- ContentHelper replaceAll
- OnScreenKeyboardModule popup chain: showPopup, clearPopup, drawPopup,
  drawPopupOverlay and their state, unreachable since the frame based UI
  was replaced by baseUI
- DebugRenderer drawDebugInfoTrampoline, drawDebugInfoSettingsTrampoline
  and the orphaned drawFrameSettings
- NodeListRenderer calculateMaxScroll, drawColumns and a stale extern
  haveGlyphs declaration with no definition
- UIRenderer::haveGlyphs, Screen::blink,
  NotificationRenderer::showKeyboardMessagePopupWithTitle,
  VirtualKeyboard::getInputText
- InkHUD touchNavLeft, touchNavRight, Applet::getActiveNodeCount,
  ThreadedMessageApplet::saveMessagesToFlash
- TwoButton::setHandlerUp, TwoButtonExtended setHandlerUp,
  setJoystickDownHandlers, setJoystickUpHandlers
- CannedMessageModule LaunchRepeatDestination, isCharInputAllowed,
  hasMessages
- TrafficManagementModule resetStats, recordRouterHopPreserved,
  saturatingIncrement
- UnitConversions::MetersPerSecondToMilesPerHour
- EncryptedStorage getSessionRemainingSeconds
- BMI270Sensor::writeRegisters, GPS::hasFlow, FSCommon copyFile,
  SerialConsole consolePrintf, buzz playLongPressLeadUp,
  memGet displayPercentHeapFree

src/modules/TrafficManagementModule.cpp

@@ -78,16 +78,6 @@ uint8_t sanitizePositionPrecision(uint8_t precision)
     return 32;
 }
 
-/**
- * Saturating increment for uint8_t counters.
- * Prevents overflow by capping at UINT8_MAX (255).
- */
-inline void saturatingIncrement(uint8_t &counter)
-{
-    if (counter < UINT8_MAX)
-        counter++;
-}
-
 /**
  * Return a short human-readable name for common port numbers.
  * Falls back to "port:<N>" for unknown ports.
@@ -224,19 +214,6 @@ meshtastic_TrafficManagementStats TrafficManagementModule::getStats() const
     return stats;
 }
 
-void TrafficManagementModule::resetStats()
-{
-    concurrency::LockGuard guard(&cacheLock);
-    stats = meshtastic_TrafficManagementStats_init_zero;
-}
-
-void TrafficManagementModule::recordRouterHopPreserved()
-{
-    // router_preserve_hops: not suitable right now - removed from config until
-    // the right heuristic for when to preserve vs. exhaust is clearer.
-    (void)stats.router_hops_preserved;
-}
-
 void TrafficManagementModule::incrementStat(uint32_t *field)
 {
     concurrency::LockGuard guard(&cacheLock);