fix: Fix duplicate atlas-toggle-btn ID and mismatched button tags (#1442)

This commit fixes issue #1442 by removing the duplicate atlas-toggle-btn
ID and fixing mismatched button tags in index.html.

Changes:
- Removed duplicate atlas-toggle-btn with title "World Directory" (line 168)
- Kept the complete atlas-toggle-btn with title "Portal Atlas" (line 176)
- Added missing closing tags for soul-toggle-btn and mode-toggle-btn
- Ensured all buttons are properly closed with matching tags

Before:
- Two atlas-toggle-btn buttons with different titles
- First one incomplete (no closing tag, no content)
- Second one complete with content
- 29 opening <button> tags, 27 closing </button> tags

After:
- Single atlas-toggle-btn with title "Portal Atlas"
- All buttons properly closed
- 28 opening <button> tags, 28 closing </button> tags
- Clean HTML structure

The duplicate was likely caused by a bad merge where two different
versions of the button were both kept instead of being resolved.

Note: Issue #1338 was closed after PR #1432 was merged, which fixed
the duplicate content blocks in README.md and POLICY.md. However,
the HTML issues in index.html (issue #1442) still needed to be fixed.

Fixes #1442

index.html

@@ -165,18 +165,18 @@
 
   <!-- Top Right: Agent Log, Atlas & SOUL Toggle -->
   <div class="hud-top-right">
-    <button id="atlas-toggle-btn" class="hud-icon-btn" title="World Directory">
-    <button id="soul-toggle-btn" class="hud-icon-btn" title="Timmy's SOUL">
-      <span class="hud-icon">✦</span>
-      <span class="hud-btn-label">SOUL</span>
-    <button id="mode-toggle-btn" class="hud-icon-btn mode-toggle" title="Toggle Mode">
-      <span class="hud-icon">👁</span>
-      <span class="hud-btn-label" id="mode-label">VISITOR</span>
-    </button>
     <button id="atlas-toggle-btn" class="hud-icon-btn" title="Portal Atlas">
       <span class="hud-icon">🌐</span>
       <span class="hud-btn-label">WORLDS</span>
     </button>
+    <button id="soul-toggle-btn" class="hud-icon-btn" title="Timmy's SOUL">
+      <span class="hud-icon">✦</span>
+      <span class="hud-btn-label">SOUL</span>
+    </button>
+    <button id="mode-toggle-btn" class="hud-icon-btn mode-toggle" title="Toggle Mode">
+      <span class="hud-icon">👁</span>
+      <span class="hud-btn-label" id="mode-label">VISITOR</span>
+    </button>
     <div id="bannerlord-status" class="hud-status-item" title="Bannerlord Readiness">
       <span class="status-dot"></span>
       <span class="status-label">BANNERLORD</span>