fix(fusion_clock): SCSS compile error — replace CSS min() with width+max-width

Odoo's Sass compiler evaluates the built-in min() function and errors with
"Incompatible units: 'px' and 'vw'" on `width: min(86vw, 380px)`, which broke
the entire web.assets_frontend bundle (kiosk + all portal pages unstyled).
Equivalent, compiler-safe: `width: 86vw; max-width: 380px;`.

Verified: forced a fresh frontend bundle compile on entech — no Incompatible
-units error, served CSS contains the compiled --pin rule. Live as 19.0.3.11.2.

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

fusion_clock/static/src/scss/nfc_kiosk.scss

@@ -514,7 +514,9 @@ html:has(#nfc_kiosk_root) {
 
     // Compact PIN-pad variant — narrower than the wide list panels, but a
     // definite width so the centred flex overlay doesn't collapse it.
-    &--pin { width: min(86vw, 380px); max-width: none; padding: 1.75rem 1.75rem 1.5rem; }
+    // (Don't use CSS min() here — Odoo's Sass compiler evaluates the built-in
+    //  min() and errors on mixed vw/px units; width+max-width is equivalent.)
+    &--pin { width: 86vw; max-width: 380px; padding: 1.75rem 1.75rem 1.5rem; }
 
     h2 {
         font-size: 1.5rem;