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- MessageStore::addFromPacket and addFromString, superseded by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/MessageStore.cpp

@@ -7,7 +7,6 @@
 #include "SafeFile.h"
 #include "gps/RTC.h"
 #include "memory/MemAudit.h"
-#include <cassert>
 #include <cstring> // memcpy
 
 #ifndef MESSAGE_TEXT_POOL_SIZE
@@ -244,40 +243,6 @@ const StoredMessage *MessageStore::tryAddFromPacket(const meshtastic_MeshPacket
     return &liveMessages.back();
 }
 
-const StoredMessage &MessageStore::addFromPacket(const meshtastic_MeshPacket &packet)
-{
-    const StoredMessage *stored = tryAddFromPacket(packet);
-    assert(stored);
-    return *stored;
-}
-
-// Outgoing/manual message
-void MessageStore::addFromString(uint32_t sender, uint8_t channelIndex, const std::string &text)
-{
-    StoredMessage sm;
-
-    // Always use our local time (helper handles RTC vs boot time)
-    assignTimestamp(sm);
-
-    sm.sender = sender;
-    sm.channelIndex = channelIndex;
-    sm.textOffset = storeTextInPool(text.c_str(), text.size());
-    sm.textLength = text.size();
-
-    // Use the provided destination
-    sm.dest = sender;
-    sm.type = MessageType::DM_TO_US;
-
-    // Outgoing messages always start with unknown ack status
-    sm.ackStatus = AckStatus::NONE;
-
-    addLiveMessage(sm);
-
-#if ENABLE_MESSAGE_PERSISTENCE
-    markMessageStoreUnsaved();
-#endif
-}
-
 #if ENABLE_MESSAGE_PERSISTENCE
 
 // Compact, fixed-size on-flash representation using offset + length