Add browser gamepad support with pad button pictograms

Co-Authored-By: deepseek-v4.1-flash (opencode-go) via CodeCraft

src/settings.rs

@@ -153,6 +153,7 @@ pub struct Settings {
     pub render_scale: u8, // old pixel-look divisor (no longer used, kept for old settings files)
     pub pixel_rows: u16,  // graphics style: rows of the world on every screen (270 pixel art, 1080 high-res)
     pub touch_ui: u8,     // touch interface: 0 = automatic (after the first touch), 1 = on, 2 = off
+    pub gamepad: u8,      // gamepad pictograms: 0 automatic (from the pad's id), 1 Xbox, 2 PlayStation, 3 Nintendo
     pub debug_fps: bool,                // show FPS and rendering backend
     pub debug_frame_time: bool,          // show the frame-time line and graph
     pub debug_ping: bool,                // show network ping
@@ -195,6 +196,7 @@ impl Default for Settings {
             render_scale: 1,
             pixel_rows: PIXEL_ART_ROWS,
             touch_ui: 0,
+            gamepad: 0,
             debug_fps: false,
             debug_frame_time: false,
             debug_ping: false,