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/admin/packages/list.tmpl

@@ -57,7 +57,7 @@
 							<td>
 								<a href="{{.Owner.HomeLink}}">{{.Owner.Name}}</a>
 								{{if .Owner.Visibility.IsPrivate}}
-									<span class="text gold">{{svg "octicon-lock"}}</span>
+									<span class="tw-text-gold">{{svg "octicon-lock"}}</span>
 								{{end}}
 							</td>
 							<td>{{.Package.Type.Name}}</td>
@@ -72,7 +72,7 @@
 							<td>{{FileSize .CalculateBlobSize}}</td>
 							<td>{{DateUtils.AbsoluteShort .Version.CreatedUnix}}</td>
 							<td>
-								<a class="text red show-modal" href data-modal="#admin-package-delete-modal"
+								<a class="tw-text-red show-modal" href data-modal="#admin-package-delete-modal"
 									data-modal-form.action="{{$.Link}}/delete?page={{$.Page.Paginater.Current}}&sort={{$.SortType}}&id={{.Version.ID}}"
 									data-modal-package-name="{{.Package.Name}}" data-modal-package-version="{{.Version.Version}}"
 								>{{svg "octicon-trash"}}</a>