fix(prefs): persist favicon choice and apply to HTML results

- Save favicon cookie on POST /preferences; reflect selection in template
- Add getFaviconService helper; pass favicon service into FromResponse
- Compute ResultView.FaviconIconURL (none/google/duckduckgo/self proxy)
- Update result_item and video_item templates; add httpapi/views tests

Made-with: Cursor

internal/views/views.go

@@ -56,16 +56,17 @@ type PageData struct {
 	ShowHeader          bool
 	IsImageSearch       bool
 	// Theme is the user's selected theme (light/dark) from cookie
-	Theme              string
+	Theme          string
+	FaviconService string
 	// New fields for three-column layout
 	Categories         []string
-	CategoryIcons     map[string]string
+	CategoryIcons      map[string]string
 	DisabledCategories []string
-	ActiveCategory    string
-	TimeFilters       []FilterOption
-	TypeFilters       []FilterOption
-	ActiveTime        string
-	ActiveType        string
+	ActiveCategory     string
+	TimeFilters        []FilterOption
+	TypeFilters        []FilterOption
+	ActiveTime         string
+	ActiveType         string
 }
 
 // ResultView is a template-friendly wrapper around a MainResult.
@@ -76,6 +77,8 @@ type ResultView struct {
 	TemplateName string
 	// Domain is the hostname extracted from the result URL, used for favicon proxying.
 	Domain string
+	// FaviconIconURL is the resolved favicon image URL for the user's favicon preference (empty = hide).
+	FaviconIconURL string
 	// SafeTitle and SafeContent are HTML-unescaped versions for rendering.
 	// The API returns HTML entities which Go templates escape by default.
 	SafeTitle   template.HTML
@@ -84,8 +87,8 @@ type ResultView struct {
 
 // PageNumber represents a numbered pagination button.
 type PageNumber struct {
-	Num        int
-	IsCurrent  bool
+	Num       int
+	IsCurrent bool
 }
 
 // InfoboxView is a template-friendly infobox.
@@ -102,9 +105,9 @@ type FilterOption struct {
 }
 
 var (
-	tmplFull    *template.Template
-	tmplIndex   *template.Template
-	tmplFragment *template.Template
+	tmplFull        *template.Template
+	tmplIndex       *template.Template
+	tmplFragment    *template.Template
 	tmplPreferences *template.Template
 )
 
@@ -152,8 +155,26 @@ func OpenSearchXML(baseURL string) ([]byte, error) {
 	return []byte(result), nil
 }
 
+// faviconIconURL returns a safe img src for the given service and hostname, or "" for none/invalid.
+func faviconIconURL(service, domain string) string {
+	domain = strings.TrimSpace(domain)
+	if domain == "" {
+		return ""
+	}
+	switch service {
+	case "google":
+		return "https://www.google.com/s2/favicons?domain=" + url.QueryEscape(domain) + "&sz=32"
+	case "duckduckgo":
+		return "https://icons.duckduckgo.com/ip3/" + domain + ".ico"
+	case "self":
+		return "/favicon/" + domain
+	default:
+		return ""
+	}
+}
+
 // FromResponse builds PageData from a search response and request params.
-func FromResponse(resp contracts.SearchResponse, query string, pageno int, activeCategory, activeTime, activeType string) PageData {
+func FromResponse(resp contracts.SearchResponse, query string, pageno int, activeCategory, activeTime, activeType, faviconService string) PageData {
 	// Set defaults
 	if activeCategory == "" {
 		activeCategory = "all"
@@ -164,9 +185,10 @@ func FromResponse(resp contracts.SearchResponse, query string, pageno int, activ
 		Pageno:              pageno,
 		NumberOfResults:     resp.NumberOfResults,
 		UnresponsiveEngines: resp.UnresponsiveEngines,
+		FaviconService:      faviconService,
 
 		// New: categories with icons
-		Categories: []string{"all", "news", "images", "videos", "maps"},
+		Categories:         []string{"all", "news", "images", "videos", "maps"},
 		DisabledCategories: []string{"shopping", "music", "weather"},
 		CategoryIcons: map[string]string{
 			"all":      "🌐",
@@ -220,11 +242,12 @@ func FromResponse(resp contracts.SearchResponse, query string, pageno int, activ
 		}
 		r.Thumbnail = util.SanitizeResultURL(r.Thumbnail)
 		pd.Results[i] = ResultView{
-			MainResult:   r,
-			TemplateName: tmplName,
-			Domain:       domain,
-			SafeTitle:    template.HTML(html.UnescapeString(r.Title)),
-			SafeContent:  template.HTML(html.UnescapeString(r.Content)),
+			MainResult:     r,
+			TemplateName:   tmplName,
+			Domain:         domain,
+			FaviconIconURL: faviconIconURL(faviconService, domain),
+			SafeTitle:      template.HTML(html.UnescapeString(r.Title)),
+			SafeContent:    template.HTML(html.UnescapeString(r.Content)),
 		}
 	}
 
@@ -328,8 +351,12 @@ func RenderSearchAuto(w http.ResponseWriter, r *http.Request, data PageData) err
 }
 
 // RenderPreferences renders the full preferences page.
-func RenderPreferences(w http.ResponseWriter, sourceURL, theme string) error {
+func RenderPreferences(w http.ResponseWriter, sourceURL, theme, faviconService string) error {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	return tmplPreferences.ExecuteTemplate(w, "base", PageData{ShowHeader: true, SourceURL: sourceURL, Theme: theme})
+	return tmplPreferences.ExecuteTemplate(w, "base", PageData{
+		ShowHeader:     true,
+		SourceURL:      sourceURL,
+		Theme:          theme,
+		FaviconService: faviconService,
+	})
 }
-