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>

templates/user/settings/security/accountlinks.tmpl

@@ -36,7 +36,7 @@
 						{{$loginSource.Name}}
 					</span>
 					{{if $loginSource.IsActive}}
-					<span class="flex-text-body text primary">{{ctx.Locale.Tr "repo.settings.active"}}</span>
+					<span class="flex-text-body tw-text-primary">{{ctx.Locale.Tr "repo.settings.active"}}</span>
 					{{end}}
 				</div>
 				<div class="flex-item-trailing">