Fix the reboot-notice build on boards without keypad navigation

The forward declaration went in among the keypad-nav ones, which sit inside
#if CAP_KEYPAD_NAV. On every board without keypad navigation the declaration
vanished while the three calls stayed, so the Heltec V4 TFT and the Wio Tracker
L2 did not compile. Same trap the popup-registry declaration already documents.

Moved to where every touch board sees it. Caught by building the matrix rather
than the one board in front of me, which is the whole reason for building it.

All nine S3 envs and both ESP32-P4 targets green.

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

src/ui-touch/UITask.cpp

@@ -3679,7 +3679,6 @@ static lv_obj_t* s_nav_focus_hint = nullptr;   // one-shot: focus this object on
 static void goToTab(int idx);                  // (defined far below) tab switch + refresh
 static int  getActiveTab();                    // (defined below) current tabview index
 static void mapNudge(int dir);                 // (defined far below) map pan — 0=up 1=down 2=left 3=right
-static void rebootWithNotice(const char* msg);  // (defined far below) reboot, with the reason on screen first
 static bool hwKeyDismissTopPopup();            // (defined far below) close the topmost modal/sheet
 static bool anyPopupOpen();                    // (defined below) is any modal/sheet currently up
 static void closeChatPanel(LvChatPanel* p);    // (defined far below) close an open chat/channel detail
@@ -10585,6 +10584,10 @@ public:
 // Import settings opens a full-screen .json picker (internal flash + SD), the
 // same UX as the lock-wallpaper picker. Defined later in this file (where the
 // SD mount state is in scope); forward-declared here for the button below.
+// Declared here, NOT among the keypad-nav forward declarations: that block is
+// inside #if CAP_KEYPAD_NAV, so the declaration disappeared on every board
+// without keypad navigation while the calls below stayed.
+static void rebootWithNotice(const char* msg);   // (defined far below) reboot, reason on screen first
 static void openBackupPicker();
 static void buildBackupsSettings();   // Settings -> Backups detail page (list/delete + factory reset)
 static void doExportBackupFile(const char* fname);   // write a backup (SD if a card is present, else internal)