fix(utility): remove mode indicator (button label is enough)

Per user: the mode indicator text 'light/dark/auto' next to the
toggle button is redundant — the button itself shows the current
mode in its label ('◐ auto' / '☀ light' / '☾ dark').

Removed:
- <span id='fx-mode-indicator'> from UtilityBar.astro
- getElementById('fx-mode-indicator') in applyTheme() JS
- (CSS for .fx-mode-indicator stays — minimal cost, no harm)

Build: 22 pages, 2.27s.

src/components/UtilityBar.astro

@@ -24,7 +24,6 @@ const email = site?.data?.email ?? 'contact@moreminimore.com';
     <span class="fx-utility-item" id="fx-date">📅 — — —</span>
   </div>
   <div class="fx-utility-bar-right">
-    <span class="fx-mode-indicator" id="fx-mode-indicator">light</span>
     <button
       type="button"
       class="fx-theme-toggle"
@@ -70,9 +69,8 @@ const email = site?.data?.email ?? 'contact@moreminimore.com';
     } else {
       document.documentElement.classList.remove('dark');
     }
-    const indicator = document.getElementById('fx-mode-indicator');
+    // Update button label to reflect current mode (button is the sole indicator)
     const btn = document.getElementById('fx-theme-toggle');
-    if (indicator) indicator.textContent = mode;  // shows user's chosen mode (not effective)
     if (btn) {
       btn.textContent = mode === 'auto' ? '◐ auto' : mode === 'light' ? '☀ light' : '☾ dark';
     }