style(trip): give Stats/Cycling panel toggles a square bordered style

Border + 4px radius instead of borderless text, matching the visual
weight of the filter pills without the full pill roundness.
Active state gets teal border + accent-light background like other active controls.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr

themes/intotheeast/css/style.css

@@ -966,9 +966,10 @@ body::after {
 }
 
 .trip-panel-toggle {
-    background: none;
-    border: none;
-    padding: 0;
+    background: transparent;
+    border: 1px solid var(--color-border);
+    border-radius: var(--radius-sm);
+    padding: var(--space-1) var(--space-3);
     font-family: var(--font-ui);
     font-size: var(--text-sm);
     font-weight: 500;
@@ -976,12 +977,19 @@ body::after {
     cursor: pointer;
     display: flex;
     align-items: center;
-    gap: var(--space-1);
-    transition: color 0.15s;
+    gap: var(--space-2);
+    transition: color 0.15s, border-color 0.15s, background 0.15s;
 }
 
-.trip-panel-toggle:hover { color: var(--color-ink); }
-.trip-panel-toggle.is-active { color: var(--color-accent); }
+.trip-panel-toggle:hover {
+    color: var(--color-ink);
+    border-color: var(--color-ink-muted);
+}
+.trip-panel-toggle.is-active {
+    color: var(--color-accent);
+    border-color: var(--color-accent);
+    background: var(--color-accent-light);
+}
 
 .trip-panel-caret {
     display: inline-block;