polish: drop dead .progress-bar / .progress-fill utilities

Created with future-API intent during the optimize pass but no .tsx
consumer materialised — the three Subscription progress bars inline
their classes directly. Dead utility classes accumulate, confuse the
next reader ("this looks like our pattern, am I doing it wrong?"),
and add bytes to the CSS. Drop both the dark version and the
.light .progress-bar override.

If a future progress bar needs them back: inline first, extract only
when 3+ call sites share intent (per /impeccable extract guidance).

src/styles/globals.css

@@ -646,18 +646,6 @@ img.twemoji {
     @apply badge border border-dark-600/50 bg-dark-700/50 text-dark-300;
   }
 
-  /* Progress bar - Dark */
-  .progress-bar {
-    @apply h-2 w-full overflow-hidden rounded-full bg-dark-800;
-  }
-
-  .progress-fill {
-    /* GPU-composited progress fill — consumer sets transform: scaleX(0..1)
-       with transform-origin: left. Avoids width-triggered reflow per frame. */
-    @apply h-full w-full origin-left rounded-full duration-500 ease-smooth;
-    transition-property: transform, background-color;
-  }
-
   /* Stat card - Dark */
   .stat-value {
     @apply text-2xl font-bold text-dark-50 sm:text-3xl;
@@ -824,11 +812,6 @@ img.twemoji {
     @apply border border-champagne-300 bg-champagne-200/50 text-champagne-700;
   }
 
-  /* Progress bar - Light */
-  .light .progress-bar {
-    @apply bg-champagne-200;
-  }
-
   /* Stat card - Light */
   .light .stat-value {
     @apply text-champagne-900;