Fix EasyMDE toolbar button dark theme selectors

Corrects the CSS selectors from .editor-toolbar a to .editor-toolbar button
since EasyMDE uses button elements, and overrides the hardcoded light hover
background so toolbar buttons are visible against the dark Slate theme.

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

Author: carlbennett

src/Static/a/footer.css

@@ -5,9 +5,9 @@
 body > footer { background-color: rgba(0,0,0,0.25); }
 
 .CodeMirror, .editor-toolbar, .editor-preview, .editor-preview-side { background: #272b30; color: #c8c8c8; border-color: #3a3f44; }
-.editor-toolbar a { color: #aaa !important; }
-.editor-toolbar a:hover, .editor-toolbar a.active { background: #3a3f44; color: #fff !important; }
-.editor-toolbar.disabled-for-preview a:not(.no-disable) { color: #555 !important; }
+.editor-toolbar button, .editor-toolbar .easymde-dropdown { color: #aaa; }
+.editor-toolbar button:hover, .editor-toolbar button.active { background: #3a3f44 !important; border-color: #555 !important; color: #fff; }
+.editor-toolbar.disabled-for-preview button:not(.no-disable) { color: #555 !important; }
 .editor-toolbar i.separator { border-left-color: #555; border-right-color: #333; }
 .CodeMirror-cursor { border-left-color: #c8c8c8; }
 .CodeMirror-selected { background: #3a3f44; }