Switch the discard button from the ghost variant (transparent fill and
border) to the default button style — paper surface with a hairline rule —
so it reads clearly while staying quieter than the accent save button.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ur8Ac6it1THCMG7aqFNVCa

diff --git a/lib/views/capture.rb b/lib/views/capture.rb
index 18789e3..a0df4b9 100644
--- a/lib/views/capture.rb
+++ b/lib/views/capture.rb
@@ -151,7 +151,7 @@ module Domus
                   end
                   button(
                     type: "button",
-                    class: "btn btn-ghost",
+                    class: "btn",
                     "@click": "reset()"
                   ) { plain "Discard" }
                 end