feat(ui): drop echo toasts for actions the screen already shows

L1: Counters reset, Trail reset, Contact added/deleted, Logged in (admin),
Logged out, Channel deleted, Share target / Bot channel / Bot room set,
PIN set/cleared, Preset saved/deleted, and Unpinned on the favourites grid.
L2: Channel deleted, Counters reset, Region/Preset/Scope/Waypoint deleted,
Target cleared, Trail cleared, Message history deleted, Contact added/deleted.
Failures and Unpinned where the item leaves the screen stay.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/companion_radio/ui-lvgl/ChannelScreen.h

@@ -145,7 +145,6 @@ void UITask::channelAction(uint8_t act) {
       if (!tapConfirmed(s_del_lbl, "Delete?")) break;
       chanctl::remove(idx);
       navClosePopup();
-      showToast("Channel deleted");
       showChats();
       break;
   }

examples/companion_radio/ui-lvgl/DiagScreen.h

@@ -383,5 +383,4 @@ void UITask::diagReset() {
   diag::resetCounters();
   navClosePopup();
   refreshDiag();
-  showToast("Counters reset");
 }

examples/companion_radio/ui-lvgl/MapRegions.h

@@ -91,7 +91,6 @@ void UITask::mapRegionAction(uint8_t act) {
       mapview::labels::flush();
       mapview::s_cache.invalidate();
       mapRegionsPopup();
-      showToast("Region deleted");
       return;
     }
   }

examples/companion_radio/ui-lvgl/NavMap.h

@@ -540,7 +540,6 @@ void UITask::navPick(int code) {
       if (navmap::s_tb.active()) { navmap::s_tb.stop(); showToast("Track back stopped"); break; }
       _core->locator.clearTarget();
       prefsSave();
-      showToast("Target cleared");
       break;
     case navmap::T_WAYPOINT: {
       if (idx >= _core->waypoints.count()) return;
@@ -734,7 +733,6 @@ void UITask::navWaypointAction(uint8_t act) {
       if (!tapConfirmed(_nav_del_lbl, "Delete?")) break;
       _core->waypoints.remove(i);
       navClosePopup();
-      showToast("Waypoint deleted");
       rebuildMapMarkers();
       layoutMap();
       refreshNavBar();
@@ -1332,7 +1330,6 @@ void UITask::navToolAction(uint8_t act) {
     case navmap::TL_TRAIL_RESET:
       if (!tapConfirmed(_nav_reset_lbl, "Reset?")) return;
       tr.reset();
-      showToast("Trail cleared");
       rebuildMapMarkers();
       layoutMap();
       break;

examples/companion_radio/ui-lvgl/RadioExtras.h

@@ -99,7 +99,6 @@ void UITask::presetAction(uint8_t act) {
       prefsSave();
       navClosePopup();
       rebuildRadio();
-      showToast("Preset deleted");
       break;
   }
 }
@@ -217,7 +216,6 @@ void UITask::scopeAction(uint8_t act) {
       if (s_scope > 0) the_mesh.removeScope((uint8_t)s_scope);
       navClosePopup();
       buildScopes();
-      showToast("Scope deleted");
       break;
   }
 }

examples/companion_radio/ui-lvgl/StorageScreen.h

@@ -355,7 +355,6 @@ void UITask::storageClearHistory() {
   s_archive.clearAll();
   _core->history.clearAll();
   _core->markAllRead();
-  showToast("Message history deleted");
   startWalk();
 }
 

examples/companion_radio/ui-lvgl/UITask.cpp

@@ -3787,7 +3787,6 @@ void UITask::nodeAction(uint8_t action) {
       break;
     case NODE_ADD:
       if (the_mesh.addDiscoveredContact(e.pub_key, e.name, e.type)) {
-        showToast("Contact added");
         _screen = SCR_NEARBY;
         buildNearby();
       } else {
@@ -3826,7 +3825,6 @@ void UITask::nodeAction(uint8_t action) {
         break;
       }
       if (the_mesh.deleteContactByKey(e.pub_key)) {
-        showToast("Contact deleted");
         _screen = SCR_NEARBY;
         buildNearby();
       }