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/user/settings/keys_ssh.tmpl

@@ -41,7 +41,7 @@
 		{{range $index, $key := .Keys}}
 			<div class="flex-item">
 				<div class="flex-item-leading">
-					<span class="text {{if .HasRecentActivity}}green{{end}}" {{if .HasRecentActivity}}data-tooltip-content="{{ctx.Locale.Tr "settings.key_state_desc"}}"{{end}}>{{svg "octicon-key" 32}}</span>
+					<span class="{{if .HasRecentActivity}}tw-text-green{{end}}" {{if .HasRecentActivity}}data-tooltip-content="{{ctx.Locale.Tr "settings.key_state_desc"}}"{{end}}>{{svg "octicon-key" 32}}</span>
 				</div>
 				<div class="flex-item-main">
 						{{if .Verified}}
@@ -52,7 +52,7 @@
 								{{.Fingerprint}}
 						</div>
 						<div class="flex-item-body">
-								<i>{{ctx.Locale.Tr "settings.added_on" (DateUtils.AbsoluteShort .CreatedUnix)}} —	{{svg "octicon-info"}} {{if .HasUsed}}{{ctx.Locale.Tr "settings.last_used"}} <span {{if .HasRecentActivity}}class="text green"{{end}}>{{DateUtils.AbsoluteShort .UpdatedUnix}}</span>{{else}}{{ctx.Locale.Tr "settings.no_activity"}}{{end}}</i>
+								<i>{{ctx.Locale.Tr "settings.added_on" (DateUtils.AbsoluteShort .CreatedUnix)}} —	{{svg "octicon-info"}} {{if .HasUsed}}{{ctx.Locale.Tr "settings.last_used"}} <span {{if .HasRecentActivity}}class="tw-text-green"{{end}}>{{DateUtils.AbsoluteShort .UpdatedUnix}}</span>{{else}}{{ctx.Locale.Tr "settings.no_activity"}}{{end}}</i>
 						</div>
 				</div>
 				<div class="flex-item-trailing">