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>

tests/integration/repo_commits_test.go

@@ -145,11 +145,11 @@ func TestRepoCommitsWithStatus(t *testing.T) {
 		testRepoCommitsWithStatus(t, "/api/v1/repos/user2/repo1/commits/v1.1/statuses", "/api/v1/repos/user2/repo1/commits/v1.1/status", state)
 	}
 
-	t.Run("pending", func(t *testing.T) { testRefMaster(t, "pending", "octicon-dot-fill", "yellow") })
-	t.Run("success", func(t *testing.T) { testRefMaster(t, "success", "octicon-check", "green") })
-	t.Run("error", func(t *testing.T) { testRefMaster(t, "error", "gitea-exclamation", "red") })
-	t.Run("failure", func(t *testing.T) { testRefMaster(t, "failure", "octicon-x", "red") })
-	t.Run("warning", func(t *testing.T) { testRefMaster(t, "warning", "gitea-exclamation", "yellow") })
+	t.Run("pending", func(t *testing.T) { testRefMaster(t, "pending", "octicon-dot-fill", "tw-text-yellow") })
+	t.Run("success", func(t *testing.T) { testRefMaster(t, "success", "octicon-check", "tw-text-green") })
+	t.Run("error", func(t *testing.T) { testRefMaster(t, "error", "gitea-exclamation", "tw-text-red") })
+	t.Run("failure", func(t *testing.T) { testRefMaster(t, "failure", "octicon-x", "tw-text-red") })
+	t.Run("warning", func(t *testing.T) { testRefMaster(t, "warning", "gitea-exclamation", "tw-text-yellow") })
 	t.Run("BranchWithSlash", func(t *testing.T) {
 		_ = db.TruncateBeans(t.Context(), &git_model.CommitStatus{})