Fix TextResizer dropdown positioning with !important

The Dropdown component's styled-components CSS sets `left: 0` with high
specificity. The plain CSS rule `left: auto; right: 0` wasn't overriding it,
causing the text resizer dropdown to be positioned incorrectly with the wrong
width.

Added `!important` to `left: auto` and `right: 0` to ensure these positioning
rules take precedence over the Dropdown's styled-components rules.

This fixes Review #47 - the text resizer dropdown should now properly align
to the right edge with the correct width.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: 2 people

src/app/content/components/Topbar/Topbar.css

@@ -248,8 +248,8 @@
 .topbar-text-resizer-menu {
   color: var(--text-resizer-color, #5e6062);
   background: #fff;
-  left: auto;
-  right: 0;
+  left: auto !important;
+  right: 0 !important;
   top: calc(100% - 1px);
   text-align: left;
   font-weight: bold;