fix(ui): revert corner-anchored context menus, centre unread badge, add room logout

- Context menus (PopupMenu, Nearby/QuickMsg call sites) go back to centring on
  screen; the header's discoverable-menu glyph stays, but dropping the popup
  out of its corner looked bad on some screens.
- Unread pill badge digit wasn't centred: Adafruit_GFX's classic built-in font
  (SH1106/SSD1306) always pads a measured string by one trailing advance
  column regardless of the glyph drawn, so centring on the raw width left 1px
  more slack on the right than the left. New DisplayDriver::
  textWidthTrailingGap() (0 by default) corrects for it on those two backends.
- On-device room Logout: mirrors the app's CMD_LOGOUT (drops keep-alive
  tracking, forgets the saved password) so a room can be deliberately signed
  out of from the Room options menu, not just re-logged-in.

Not build-verified — no PlatformIO toolchain available this session.

examples/companion_radio/MyMesh.h

@@ -230,6 +230,16 @@ public:
     return true;
   }
 
+  // On-device UI logout: drops the local keep-alive tracking (mirrors the app's
+  // CMD_LOGOUT) and forgets the saved password, so the next room open prompts
+  // for credentials again instead of silently re-using them. No packet is sent
+  // to the server -- the room ACL has no session state to tear down, this is
+  // purely local "forget this login" bookkeeping.
+  void logoutRoom(const uint8_t* pub_key) {
+    stopConnection(pub_key);
+    forgetRoomPassword(pub_key);
+  }
+
   // On-device-saved room/repeater login passwords, persisted to flash (own
   // small file, independent of /contacts3) so a room that's already been
   // logged into doesn't need its password retyped after reboot.

examples/companion_radio/ui-new/NearbyScreen.h

@@ -415,7 +415,7 @@ class NearbyScreen : public UIScreen {
   void startDeleteConfirm() {
     const Entry* e = selected();
     if (!e || !e->has_key || !entryIsContact(e)) return;
-    _confirm.begin("Delete contact?", 2, true);
+    _confirm.begin("Delete contact?", 2);
     _confirm.addItem("Delete");
     _confirm.addItem("Cancel");
     _confirm.setSelected(1);
@@ -451,7 +451,7 @@ class NearbyScreen : public UIScreen {
 
   void rebuildPingMenu() {
     int keep = _ping_menu.selectedIndex();  // preserve selection across a rebuild
-    _ping_menu.begin("Ping", 4, true);
+    _ping_menu.begin("Ping", 4);
     _ping_menu.addItem("Send");
     if (_ping_time_str[0])      _ping_menu.addItem(_ping_time_str);
     if (_ping_snr_out_str[0])   _ping_menu.addItem(_ping_snr_out_str);
@@ -543,7 +543,7 @@ class NearbyScreen : public UIScreen {
 
     buildSortLabel();
     _menu_action_count = 0;
-    _menu.begin("Options", 10, true);
+    _menu.begin("Options", 10);
     auto add = [&](const char* label, Action a) {
       _menu.addItem(label);
       _menu_actions[_menu_action_count++] = a;

examples/companion_radio/ui-new/PopupMenu.h

@@ -17,16 +17,14 @@ struct PopupMenu {
   int         _cap;       // actual visible cap, updated each render()
   bool        active;
   const char* _title;
-  bool        anchor_tr = false;  // opt-in: drop from the top-right ≡ hint instead of centring
 
   enum Result { NONE, SELECTED, CANCELLED };
 
   PopupMenu() : _count(0), _sel(0), _scroll(0), _visible(3), _cap(3), active(false), _title(nullptr) {}
 
-  void begin(const char* title, int visible = 3, bool anchor_top_right = false) {
+  void begin(const char* title, int visible = 3) {
     _count = 0; _sel = 0; _scroll = 0;
     _visible = visible; _cap = visible; active = true; _title = title;
-    anchor_tr = anchor_top_right;
   }
 
   void addItem(const char* item) {
@@ -88,17 +86,8 @@ struct PopupMenu {
     int bh = title_h + vis * item_h + 1;   // +1 keeps the last row off the bottom border
 
     // Centre on screen (clamped to the margins on small displays).
-    int bx, by;
-    if (anchor_tr) {
-      // Drop out of the top-right ≡ hint: right-aligned under the header, so the
-      // menu reads as emerging from the glyph that spawned it.
-      bx = display.width() - bw - margin;
-      by = display.headerH();
-      if (by + bh > display.height() - margin) by = display.height() - margin - bh;
-    } else {
-      bx = (display.width()  - bw) / 2;
-      by = (display.height() - bh) / 2;
-    }
+    int bx = (display.width()  - bw) / 2;
+    int by = (display.height() - bh) / 2;
     if (bx < margin) bx = margin;
     if (by < margin) by = margin;
 

examples/companion_radio/ui-new/QuickMsgScreen.h

@@ -255,7 +255,7 @@ class QuickMsgScreen : public UIScreen {
     int n = (reply_allowed ? 1 : 0) + (has_loc ? 2 : 0);
     if (n == 0) return;
     _fs_act_n = 0;
-    _ctx_menu.begin("Options", n, true);
+    _ctx_menu.begin("Options", n);
     if (reply_allowed) { _ctx_menu.addItem("Reply");         _fs_act[_fs_act_n++] = FS_REPLY; }
     if (has_loc)       { _ctx_menu.addItem("Navigate");      _fs_act[_fs_act_n++] = FS_NAV;
                          _ctx_menu.addItem("Save waypoint"); _fs_act[_fs_act_n++] = FS_SAVE; }
@@ -602,6 +602,24 @@ public:
     memcpy(_room_login_prefix[pos], pub_key, 4);
   }
 
+  // Reverses markRoomLoggedIn() on explicit Logout -- shifts the ring buffer
+  // closed over the removed slot so isRoomLoggedIn() goes back to false and
+  // the next room open prompts for a password instead of skipping it.
+  void forgetRoomLoggedIn(const uint8_t* pub_key) {
+    for (int i = 0; i < _room_login_count; i++) {
+      int pos = (_room_login_head + i) % ROOM_LOGIN_TABLE_SIZE;
+      if (memcmp(_room_login_prefix[pos], pub_key, 4) == 0) {
+        for (int j = i; j < _room_login_count - 1; j++) {
+          int from = (_room_login_head + j + 1) % ROOM_LOGIN_TABLE_SIZE;
+          int to   = (_room_login_head + j) % ROOM_LOGIN_TABLE_SIZE;
+          memcpy(_room_login_prefix[to], _room_login_prefix[from], 4);
+        }
+        _room_login_count--;
+        return;
+      }
+    }
+  }
+
   // Password of the room-login attempt currently in flight -- set right
   // before sendRoomLogin(), read back in onRoomLoginResult() so a successful
   // attempt can be persisted (see MyMesh::saveRoomPassword()).
@@ -1200,7 +1218,7 @@ public:
       if (c == KEY_CONTEXT_MENU) {
         // PopupMenu stores the title pointer verbatim — use static strings.
         static const char* MODE_TITLES[] = { "DM options", "Channel options", "Room options" };
-        _ctx_menu.begin(MODE_TITLES[_mode_sel < 3 ? _mode_sel : 0], 1, true);
+        _ctx_menu.begin(MODE_TITLES[_mode_sel < 3 ? _mode_sel : 0], 1);
         _ctx_menu.addItem("Mark all read");
         return true;
       }
@@ -1224,10 +1242,18 @@ public:
           auto res = _ctx_menu.handleInput(c);
           if (res == PopupMenu::SELECTED && _num_contacts > 0) {
             if (the_mesh.getContactByIdx(_sorted[_contact_sel], _sel_contact)) {
-              _login_mode = true;
-              _kb->begin("", 15); // room/repeater password: max 15 chars
-              _kb->clearPlaceholders();   // {loc}/{time} are for messages, not a password
-              _phase = KEYBOARD;
+              int sel = _ctx_menu.selectedIndex();
+              if (sel == 0) {
+                _login_mode = true;
+                _kb->begin("", 15); // room/repeater password: max 15 chars
+                _kb->clearPlaceholders();   // {loc}/{time} are for messages, not a password
+                _phase = KEYBOARD;
+              } else {
+                // Logout: only reachable when isRoomLoggedIn() added this item.
+                the_mesh.logoutRoom(_sel_contact.id.pub_key);
+                forgetRoomLoggedIn(_sel_contact.id.pub_key);
+                _task->showAlert("Logged out", 1000);
+              }
             }
           }
           return true;
@@ -1314,7 +1340,7 @@ public:
                     snprintf(_pin_slot_labels[s], sizeof(_pin_slot_labels[s]), "Slot %d: %s", s + 1, nm);
                   }
                 }
-                _ctx_menu.begin("Pick slot", 3, true);
+                _ctx_menu.begin("Pick slot", 3);
                 for (int s = 0; s < NodePrefs::FAVOURITES_COUNT; s++) _ctx_menu.addItem(_pin_slot_labels[s]);
                 _pin_picker_active = true;
               }
@@ -1355,8 +1381,11 @@ public:
         return true;
       }
       if (c == KEY_CONTEXT_MENU && _num_contacts > 0 && _room_mode) {
-        _ctx_menu.begin("Room options", 1, true);
+        ContactInfo ci;
+        bool logged_in = the_mesh.getContactByIdx(_sorted[_contact_sel], ci) && isRoomLoggedIn(ci.id.pub_key);
+        _ctx_menu.begin("Room options", logged_in ? 2 : 1);
         _ctx_menu.addItem("Login...");
+        if (logged_in) _ctx_menu.addItem("Logout");
         return true;
       }
       if (c == KEY_CONTEXT_MENU && _num_contacts > 0 && !_room_mode) {
@@ -1371,7 +1400,7 @@ public:
         int pinned_slot = _task->findFavouriteSlot(ci.id.pub_key);
         if (pinned_slot >= 0) snprintf(_ctx_pin_item, sizeof(_ctx_pin_item), "Unpin (slot %d)", pinned_slot + 1);
         else                  snprintf(_ctx_pin_item, sizeof(_ctx_pin_item), "Pin to dial");
-        _ctx_menu.begin("Contact options", 3, true);
+        _ctx_menu.begin("Contact options", 3);
         _ctx_menu.addItem("Mark as read");
         _ctx_menu.addItem(_ctx_notif_item);
         _ctx_menu.addItem(_ctx_melody_item);
@@ -1471,7 +1500,7 @@ public:
         { NodePrefs* p2 = _task->getNodePrefs();
           bool is_fav = p2 && (p2->ch_fav_bitmask & (1ULL << ch_idx));
           snprintf(_ctx_ch_fav_item, sizeof(_ctx_ch_fav_item), is_fav ? "Fav: yes" : "Fav: no"); }
-        _ctx_menu.begin("Channel options", 4, true);
+        _ctx_menu.begin("Channel options", 4);
         _ctx_menu.addItem("Mark all read");
         _ctx_menu.addItem(_ctx_notif_item);
         _ctx_menu.addItem(_ctx_melody_item);