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`.

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

templates/admin/org/list.tmpl

@@ -54,7 +54,7 @@
 							<td>
 								<a href="{{.HomeLink}}">{{if and DefaultShowFullName .FullName}}{{.FullName}} ({{.Name}}){{else}}{{.Name}}{{end}}</a>
 								{{if .Visibility.IsPrivate}}
-									<span class="text gold">{{svg "octicon-lock"}}</span>
+									<span class="tw-text-gold">{{svg "octicon-lock"}}</span>
 								{{end}}
 								{{if eq .Type 3}}{{/* Reserved organization */}}
 									<span class="ui mini label">{{ctx.Locale.Tr "admin.users.reserved"}}</span>