Launch Broadcast FM overlay from FM action

App/app/action.c

@@ -28,6 +28,9 @@
 #ifdef ENABLE_FMRADIO
     #include "app/fm.h"
 #endif
+#ifdef ENABLE_FEAT_F4HWN_OVERLAY_APPS
+    #include "apps/app_overlay.h"
+#endif
 #include "app/scanner.h"
 #include "audio.h"
 #ifdef ENABLE_FMRADIO
@@ -468,13 +471,8 @@ void ACTION_Handle(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 void ACTION_FM(void)
 {
 #ifdef ENABLE_FEAT_F4HWN_OVERLAY_APPS
-    /* Overlay apps replace the resident FM screen with the FM overlay app, so
-       this launcher is inert. Every external entry point - the assignable
-       side-key, the F+0 key, the boot-state resume - funnels through here, and
-       gFmRadioMode is only ever set from inside this function, so returning
-       early keeps the resident screen from ever opening. fm.c still links
-       against ACTION_FM; its own EXIT-path calls are unreachable because the
-       resident screen never opens. */
+    if (APP_LaunchOverlayByName("Broadcast FM") != APP_OK)
+        gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
     return;
 #else
     if (gCurrentFunction != FUNCTION_TRANSMIT && gCurrentFunction != FUNCTION_MONITOR)

App/apps/app_overlay.c

@@ -633,6 +633,19 @@ uint8_t APP_ValidateSlot(uint8_t slot, app_header_t *out_header)
     return APP_OK;
 }
 
+uint8_t APP_LaunchOverlayByName(const char *name)
+{
+    app_header_t h;
+
+    for (uint8_t slot = 0; slot < APP_SLOT_COUNT; slot++) {
+        if (APP_ValidateSlot(slot, &h) == APP_OK &&
+            strncmp(h.name, name, APP_NAME_LEN) == 0)
+            return APP_LaunchOverlay(slot);
+    }
+
+    return APP_ERR_MAGIC;
+}
+
 uint8_t APP_SlotInfo(uint8_t slot, app_header_t *out_header)
 {
     if (slot >= APP_SLOT_COUNT)

App/apps/app_overlay.h

@@ -103,6 +103,9 @@ uint8_t APP_ValidateSlot(uint8_t slot, app_header_t *out_header);
  * Returns when the app exits; the internal flash is never touched. */
 uint8_t APP_LaunchOverlay(uint8_t slot);
 
+/* Find the first valid app with this exact header name and launch it. */
+uint8_t APP_LaunchOverlayByName(const char *name);
+
 /* Host-tool slot management (external flash only, never brick-critical). */
 uint8_t APP_SlotInfo(uint8_t slot, app_header_t *out_header);
 uint8_t APP_SlotErase(uint8_t slot);