ui: rounded touch keys, vertically centered row keys, right-aligned connection status on the wallets page

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

art/sprites.py

@@ -752,6 +752,19 @@ UI_ICONS['ui_hw_shell'] = lambda: rounded(32, 7, 'K', 'E', 'z')
 UI_ICONS['ui_hw_bezel'] = lambda: rounded(16, 4, 'n')
 UI_ICONS['ui_hw_paper'] = lambda: rounded(12, 2, 'P')
 UI_ICONS['ui_hw_sel'] = hw_selected
+def hw_key():
+    """触控键底图（九宫格，白色，可着色）：圆角 3 像素，没有描边，颜色由界面按状态着色。"""
+    size, r = 12, 3
+    c = Canvas(size, size)
+    for y in range(size):
+        for x in range(size):
+            cx = min(max(x, r), size - 1 - r); cy = min(max(y, r), size - 1 - r)
+            if (x - cx) ** 2 + (y - cy) ** 2 <= r * r + r * 0.6:
+                c.put(x, y, 'w')
+    return c
+
+
+UI_ICONS['ui_hw_key'] = hw_key
 UI_ICONS['ui_hw_groove'] = hw_groove
 UI_ICONS['ui_hw_ok'] = lambda: hw_button('ok')
 UI_ICONS['ui_hw_no'] = lambda: hw_button('no')