fix: grey out the charmap Copy button while showing "Copied"

Render the button in its disabled state during the post-copy confirmation
window, matching the Bluetooth app's greyed-out "Scanning..." button.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

programs/src/charmap/main.cpp

@@ -421,9 +421,10 @@ static void render(Canvas& c) {
               meta, g_theme.text_subtle, META_SIZE);
 
     // Copy button — canonical MTK primary button, like other Montauk apps.
-    // Its label flips to "Copied" for a moment after a copy as confirmation.
+    // After a copy it flips to a greyed-out "Copied" for a moment (the disabled
+    // state, matching the Bluetooth app's "Scanning..." button) as confirmation.
     bool just_copied = g_copied_until && montauk::get_milliseconds() < g_copied_until;
-    mtk::WidgetState copy_state = mtk::widget_state(false, g_copy_hover, true);
+    mtk::WidgetState copy_state = mtk::widget_state(false, g_copy_hover, !just_copied);
     mtk::draw_button(c, L.copy_btn, just_copied ? "Copied" : "Copy",
                      mtk::BUTTON_PRIMARY, copy_state, g_theme);
 }