Fix emulator build script, UI rendering, and clean up repo

display/low_level_render.cpp

@@ -671,3 +671,57 @@ int LowLevelRenderer::draw_string_scaled(int x, int y, const char* text, int sca
     }
     return current_x;
 }
+int LowLevelRenderer::get_char_width_scaled(char c, int scale) {
+  if (!current_font)
+    return 0;
+
+  if (c < 32 || c > 127)
+    return 0;
+  if (scale < 1)
+    scale = 1;
+
+  int font_idx = c - 32;
+  const unsigned char *char_data = current_font->get_char_data(font_idx);
+  if (!char_data)
+    return 0;
+
+  int bytes_per_char = current_font->get_bytes_per_char();
+
+  // Find the actual width by skipping trailing empty columns
+  int actual_width = 0;
+  for (int col = bytes_per_char - 1; col >= 0; col--) {
+    if (char_data[col] != 0) {
+      actual_width = col + 1;
+      break;
+    }
+  }
+
+  return actual_width * scale;
+}
+
+int LowLevelRenderer::get_string_width_scaled(const char *text, int scale,
+                                              int spacing) {
+  if (!current_font)
+    return 0;
+  int width = 0;
+  int i = 0;
+  while (text[i] != '\0') {
+    int char_width = get_char_width_scaled(text[i], scale);
+    // Add spacing only if it's not the last character, but logic usually adds
+    // spacing after each char In drawn_string_scaled: current_x += char_width +
+    // (spacing * scale); So width accumulates char_width + spacing*scale.
+    // However, the last character shouldn't really have spacing if we want
+    // exact bounding box, but let's match draw_string_scaled behavior which
+    // effectively advances cursor. Wait, draw_string_scaled returns
+    // `current_x`. If x=0, current_x ends up at sum(char_width +
+    // spacing*scale).
+
+    width += char_width + (spacing * scale);
+    i++;
+  }
+  // Correction: draw_string_scaled includes spacing after the last character.
+  // If we want exact pixel width of the visible text, we might want to subtract
+  // the last spacing. But for UI alignment, usually cursor advancement is fine.
+  // Let's stick to returning what draw_string_scaled would add to x.
+  return width;
+}