Refactor text utility classes to Tailwind CSS (#36703)

Replace Fomantic/custom CSS text utility classes with their Tailwind
equivalents:

- `.text.<color>` compound classes → `tw-text-<color>` classes
- `.text.small` (`font-size: 0.75em`) → `tw-text-xs` (11px)
- `.text.truncate` (`overflow-x: hidden; text-overflow: ellipsis;
white-space: nowrap; display: inline-block`) → `tw-inline-block
tw-truncate`

Remove the now-unused CSS rules from `base.css` and `dashboard.css`.

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

web_src/css/dashboard.css

@@ -22,11 +22,6 @@
   justify-content: space-between;
 }
 
-.dashboard.feeds .filter.menu .item .text.truncate,
-.dashboard.issues .filter.menu .item .text.truncate {
-  width: 75%;
-}
-
 /* Sort */
 .dashboard.feeds .filter.menu .jump.item,
 .dashboard.issues .filter.menu .jump.item {