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/org/team/sidebar.tmpl

@@ -21,7 +21,7 @@
 			{{if .Team.Description}}
 				{{.Team.Description}}
 			{{else}}
-				<span class="text grey tw-italic">{{ctx.Locale.Tr "org.teams.no_desc"}}</span>
+				<span class="tw-text-text-light tw-italic">{{ctx.Locale.Tr "org.teams.no_desc"}}</span>
 			{{end}}
 		</div>
 		{{if eq .Team.LowerName "owners"}}