Merge dev: burn fix, version label, theme persistence, admin/settings UI, theme grid, CSP fix, docs

t.colors was removed by #113; rendering threw on first iteration and
the theme grid rendered empty. Use the colors returned by
presetColors(t.id) instead. Verified in headless chromium: 5
theme-card elements render on /settings.

internal/web/securityheaders_test.go

@@ -16,7 +16,7 @@ func TestSecurityHeaders(t *testing.T) {
 	h := SecurityHeaders(pages)
 	rec := httptest.NewRecorder()
 	h.ServeHTTP(rec, httptest.NewRequest("GET", "/", nil))
-	wantCSP := "default-src 'self'; script-src 'self' 'unsafe-inline'; frame-ancestors 'none'"
+	wantCSP := "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; frame-ancestors 'none'"
 	if got := rec.Header().Get("Content-Security-Policy"); got != wantCSP {
 		t.Errorf("CSP = %q, want %q", got, wantCSP)
 	}

internal/web/templates/settings.html

@@ -44,7 +44,7 @@
     btn.className = 'theme-card';
     btn.setAttribute('aria-pressed', current === t.id ? 'true' : 'false');
     btn.innerHTML = '<strong>' + t.name + '</strong>' +
-      '<span class="swatches">' + t.colors.map(function (c) {
+      '<span class="swatches">' + colors.map(function (c) {
         return '<span class="swatch" style="background:' + c + '"></span>';
       }).join('') + '</span>';
     btn.addEventListener('click', function () {

internal/web/web.go

@@ -344,7 +344,7 @@ func SecurityHeaders(next http.Handler) http.Handler {
 		// is harmless and arguably desirable.
 		h := w.Header()
 		h.Set("Content-Security-Policy",
-			"default-src 'self'; script-src 'self' 'unsafe-inline'; frame-ancestors 'none'")
+			"default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; frame-ancestors 'none'")
 		h.Set("Referrer-Policy", "no-referrer")
 		h.Set("X-Content-Type-Options", "nosniff")
 		next.ServeHTTP(w, r)