fix(branding): use regular "i" glyph with green dot overlay

The dotless i (ı) wasn't rendering in all fonts. Switch to a regular "i"
with the green dot CSS overlay positioned on top of the native dot.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/partials/settings-modal.html

@@ -530,7 +530,7 @@
         <div id="settings-about" class="settings-section">
             <div class="settings-group">
                 <div class="about-info">
-                    <p><strong><span class="brand-i">&#x131;</span>NTERCEPT</strong> - Signal Intelligence Platform</p>
+                    <p><strong><span class="brand-i">i</span>NTERCEPT</strong> - Signal Intelligence Platform</p>
                     <p>Version: <span class="about-version">{{ version }}</span></p>
                     <p>
                         A unified web interface for software-defined radio (SDR) tools,
@@ -546,7 +546,7 @@
             <div class="settings-group">
                 <div class="settings-group-title">Support the Project</div>
                 <p style="color: var(--text-dim); margin-bottom: 15px; font-size: 12px;">
-                    If you find <span class="brand-i">&#x131;</span>NTERCEPT useful, consider supporting its development.
+                    If you find <span class="brand-i">i</span>NTERCEPT useful, consider supporting its development.
                 </p>
                 <a href="https://buymeacoffee.com/smittix" target="_blank" rel="noopener noreferrer" class="donate-btn">
                     <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="width: 18px; height: 18px; vertical-align: -3px; margin-right: 8px;">