refactor: tailwind tier 1 — border-subtle/text-secondary/focus-ring utilities + Input config extraction

src/shared/ui/ComboControl/ComboControl.svelte

@@ -93,9 +93,7 @@ const displayLabel = $derived(label ?? controlLabel ?? '');
             step={control.step}
             orientation="horizontal"
         />
-        <span
-            class="font-mono text-[0.6875rem] text-neutral-500 dark:text-neutral-400 tabular-nums w-10 text-right shrink-0"
-        >
+        <span class="font-mono text-[0.6875rem] text-secondary tabular-nums w-10 text-right shrink-0">
             {formattedValue()}
         </span>
     </div>
@@ -129,7 +127,7 @@ const displayLabel = $derived(label ?? controlLabel ?? '');
                                 'border border-transparent',
                                 'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-brand/30',
                                 open
-                                    ? 'bg-paper dark:bg-dark-card shadow-sm border-black/5 dark:border-white/10'
+                                    ? 'bg-paper dark:bg-dark-card shadow-sm border-subtle'
                                     : 'hover:bg-paper/50 dark:hover:bg-dark-card/50',
                             )}
                             aria-label={controlLabel}
@@ -157,7 +155,7 @@ const displayLabel = $derived(label ?? controlLabel ?? '');
 
                 <!-- Vertical slider popover -->
                 <PopoverContent
-                    class="w-auto py-4 px-3 h-64 flex items-center justify-center rounded-none border border-black/5 dark:border-white/10 shadow-sm bg-paper dark:bg-dark-card"
+                    class="w-auto py-4 px-3 h-64 flex items-center justify-center rounded-none border border-subtle shadow-sm bg-paper dark:bg-dark-card"
                     align="center"
                     side="top"
                 >