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/install.tmpl

@@ -160,7 +160,7 @@
 					<div>
 						<!-- Email -->
 						<details class="optional field">
-							<summary class="right-content tw-py-2{{if .Err_SMTP}} text red{{end}}">
+							<summary class="right-content tw-py-2{{if .Err_SMTP}} tw-text-red{{end}}">
 								{{ctx.Locale.Tr "install.email_title"}}
 							</summary>
 							<div class="inline field">
@@ -200,7 +200,7 @@
 
 						<!-- Server and other services -->
 						<details class="optional field">
-							<summary class="right-content tw-py-2{{if .Err_Services}} text red{{end}}">
+							<summary class="right-content tw-py-2{{if .Err_Services}} tw-text-red{{end}}">
 								{{ctx.Locale.Tr "install.server_service_title"}}
 							</summary>
 							<div class="inline field">
@@ -298,7 +298,7 @@
 
 						<!-- Admin -->
 						<details class="optional field">
-							<summary class="right-content tw-py-2{{if .Err_Admin}} text red{{end}}">
+							<summary class="right-content tw-py-2{{if .Err_Admin}} tw-text-red{{end}}">
 								{{ctx.Locale.Tr "install.admin_title"}}
 							</summary>
 							<p class="center">{{ctx.Locale.Tr "install.admin_setting_desc"}}</p>