feat: add Console Session mode

programs/src/login/login_render.cpp

@@ -51,6 +51,20 @@ LoginLayout layout_login_screen(LoginState* ls) {
         y = lo.password_field.y + FIELD_H + FIELD_GAP;
     }
 
+    // Session selector (login mode only): a "Session" label above two radio
+    // options that pick the desktop or the full-screen console.
+    if (ls->mode == MODE_LOGIN) {
+        lo.session_label_y = y;
+        int ry = y + sfh + LABEL_GAP;
+        int radio_h = 22;
+        int half = lo.content_w / 2;
+        lo.desktop_radio = {lo.content_x, ry, half, radio_h};
+        lo.console_radio = {lo.content_x + half, ry, half, radio_h};
+        y = ry + radio_h + FIELD_GAP;
+    } else {
+        lo.session_label_y = -1;
+    }
+
     if (ls->show_error) {
         lo.error_y = y;
         y += sfh + 12;
@@ -81,11 +95,14 @@ LoginLayout layout_login_screen(LoginState* ls) {
     lo.shutdown_button = offset_rect(lo.shutdown_button, card_x, card_y);
     lo.reboot_button = offset_rect(lo.reboot_button, card_x, card_y);
     lo.submit_button = offset_rect(lo.submit_button, card_x, card_y);
+    lo.desktop_radio = offset_rect(lo.desktop_radio, card_x, card_y);
+    lo.console_radio = offset_rect(lo.console_radio, card_x, card_y);
 
     lo.content_x += card_x;
     lo.heading_y += card_y;
     lo.subtitle_y += card_y;
     if (lo.error_y >= 0) lo.error_y += card_y;
+    if (lo.session_label_y >= 0) lo.session_label_y += card_y;
     return lo;
 }
 
@@ -155,6 +172,15 @@ void draw_login_screen(LoginState* ls) {
               ls->password_input, true, ls->active_field == 1);
     }
 
+    // ==== Session selector ====
+    if (ls->mode == MODE_LOGIN && lo.session_label_y >= 0) {
+        c.text(lo.content_x, lo.session_label_y, "Session", th.text_muted);
+        mtk::draw_radio(c, lo.desktop_radio, "Desktop",
+                        ls->session_mode == SESSION_DESKTOP, th);
+        mtk::draw_radio(c, lo.console_radio, "Console",
+                        ls->session_mode == SESSION_CONSOLE, th);
+    }
+
     if (ls->show_error && lo.error_y >= 0)
         c.text(lo.content_x, lo.error_y, ls->error_msg, th.danger);