feat: add pull-to-refresh button to top bar for all list views

Add a sticky top bar with a refresh button that uses HTMX to re-fetch
the current view content without a full page reload. Works on dashboard,
issues, and pulls views via the shared layout template.

Closes leeworks-agents/gitea-mobile#51

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

static/style.css

@@ -47,10 +47,53 @@ body {
   -moz-osx-font-smoothing: grayscale;
 }
 
+/* Top bar */
+.top-bar {
+  position: sticky;
+  top: 0;
+  z-index: 100;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: var(--spacing-sm) var(--spacing-lg);
+  padding-top: max(var(--spacing-sm), env(safe-area-inset-top));
+  background: var(--bg-secondary);
+  border-bottom: 1px solid var(--border);
+}
+
+.top-bar-title {
+  font-size: var(--font-base);
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+.refresh-btn {
+  background: none;
+  border: none;
+  color: var(--text-secondary);
+  font-size: 1.4rem;
+  padding: var(--spacing-xs) var(--spacing-sm);
+  cursor: pointer;
+  -webkit-tap-highlight-color: transparent;
+  line-height: 1;
+  border-radius: var(--radius-sm);
+  transition: color 0.15s ease, background 0.15s ease;
+}
+
+.refresh-btn:active {
+  color: var(--accent-blue);
+  background: var(--bg-tertiary);
+}
+
+.refresh-btn.htmx-request {
+  animation: spin 0.6s linear infinite;
+  pointer-events: none;
+}
+
 /* Content area */
 .content {
   padding: var(--spacing-lg);
-  padding-top: max(var(--spacing-lg), env(safe-area-inset-top));
+  padding-top: var(--spacing-lg);
   max-width: 640px;
   margin: 0 auto;
 }