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/stacktrace-row.tmpl

@@ -20,7 +20,7 @@
 				<a class="link-action" data-url="{{.root.Link}}/cancel/{{.Process.PID}}"
 					data-modal-confirm-header="{{ctx.Locale.Tr "admin.monitor.process.cancel"}}"
 					data-modal-confirm-content="{{ctx.Locale.Tr "admin.monitor.process.cancel_desc"}}"
-				>{{svg "octicon-trash" 16 "text-red"}}</a>
+				>{{svg "octicon-trash" 16 "tw-text-red"}}</a>
 			{{end}}
 		</div>
 	</div>