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/projects/list.tmpl

@@ -67,7 +67,7 @@
 					{{else}}
 						<a class="link-action flex-text-inline" href data-url="{{.Link ctx}}/close">{{svg "octicon-skip" 14}}{{ctx.Locale.Tr "repo.projects.close"}}</a>
 					{{end}}
-					<a class="link-action flex-text-inline text red" href data-modal-confirm="#repo-project-delete-modal" data-url="{{.Link ctx}}/delete">{{svg "octicon-trash" 14}}{{ctx.Locale.Tr "repo.issues.label_delete"}}</a>
+					<a class="link-action flex-text-inline tw-text-red" href data-modal-confirm="#repo-project-delete-modal" data-url="{{.Link ctx}}/delete">{{svg "octicon-trash" 14}}{{ctx.Locale.Tr "repo.issues.label_delete"}}</a>
 				</div>
 				{{end}}
 			</div>