feat: Wikidata engine and Wikipedia knowledge infobox

- Add wikidata engine (wbsearchentities), tests, factory/planner/config
- Wikipedia REST summary: infobox from extract, thumbnail, article URL
- InfoboxView URL; render infobox list in results_inner + base styles
- Preferences Wikidata toggle; engine badge color for wikidata

Made-with: Cursor

internal/engines/wikipedia.go

@@ -123,13 +123,13 @@ func (e *WikipediaEngine) Search(ctx context.Context, req contracts.SearchReques
 
 	if resp.StatusCode == http.StatusNotFound {
 		return contracts.SearchResponse{
-			Query:            req.Query,
-			NumberOfResults: 0,
-			Results:          []contracts.MainResult{},
-			Answers:          []map[string]any{},
-			Corrections:      []string{},
-			Infoboxes:        []map[string]any{},
-			Suggestions:      []string{},
+			Query:               req.Query,
+			NumberOfResults:     0,
+			Results:             []contracts.MainResult{},
+			Answers:             []map[string]any{},
+			Corrections:         []string{},
+			Infoboxes:           []map[string]any{},
+			Suggestions:         []string{},
 			UnresponsiveEngines: [][2]string{},
 		}, nil
 	}
@@ -141,9 +141,13 @@ func (e *WikipediaEngine) Search(ctx context.Context, req contracts.SearchReques
 	var api struct {
 		Title       string `json:"title"`
 		Description string `json:"description"`
+		Extract     string `json:"extract"`
 		Titles      struct {
 			Display string `json:"display"`
 		} `json:"titles"`
+		Thumbnail struct {
+			Source string `json:"source"`
+		} `json:"thumbnail"`
 		ContentURLs struct {
 			Desktop struct {
 				Page string `json:"page"`
@@ -160,7 +164,7 @@ func (e *WikipediaEngine) Search(ctx context.Context, req contracts.SearchReques
 		// API returned a non-standard payload; treat as no result.
 		return contracts.SearchResponse{
 			Query:               req.Query,
-			NumberOfResults:    0,
+			NumberOfResults:     0,
 			Results:             []contracts.MainResult{},
 			Answers:             []map[string]any{},
 			Corrections:         []string{},
@@ -175,36 +179,61 @@ func (e *WikipediaEngine) Search(ctx context.Context, req contracts.SearchReques
 		title = api.Title
 	}
 
-	content := api.Description
+	content := strings.TrimSpace(api.Extract)
+	if content == "" {
+		content = strings.TrimSpace(api.Description)
+	}
 
 	urlPtr := pageURL
 	pub := (*string)(nil)
 
+	// Knowledge infobox for HTML (Wikipedia REST summary: title, extract, thumbnail, link).
+	var infoboxes []map[string]any
+	ibTitle := api.Titles.Display
+	if ibTitle == "" {
+		ibTitle = api.Title
+	}
+	body := strings.TrimSpace(api.Extract)
+	if body == "" {
+		body = strings.TrimSpace(api.Description)
+	}
+	imgSrc := strings.TrimSpace(api.Thumbnail.Source)
+	if ibTitle != "" || body != "" || imgSrc != "" {
+		row := map[string]any{
+			"title":   ibTitle,
+			"infobox": body,
+			"url":     pageURL,
+		}
+		if imgSrc != "" {
+			row["img_src"] = imgSrc
+		}
+		infoboxes = append(infoboxes, row)
+	}
+
 	results := []contracts.MainResult{
 		{
-			Template: "default.html",
-			Title:    title,
-			Content:  content,
-			URL:      &urlPtr,
-			Pubdate:  pub,
-			Engine:   "wikipedia",
-			Score:    0,
-			Category: "general",
-			Priority: "",
+			Template:  "default.html",
+			Title:     title,
+			Content:   content,
+			URL:       &urlPtr,
+			Pubdate:   pub,
+			Engine:    "wikipedia",
+			Score:     0,
+			Category:  "general",
+			Priority:  "",
 			Positions: nil,
-			Engines:  []string{"wikipedia"},
+			Engines:   []string{"wikipedia"},
 		},
 	}
 
 	return contracts.SearchResponse{
 		Query:               req.Query,
-		NumberOfResults:    len(results),
+		NumberOfResults:     len(results),
 		Results:             results,
 		Answers:             []map[string]any{},
 		Corrections:         []string{},
-		Infoboxes:           []map[string]any{},
+		Infoboxes:           infoboxes,
 		Suggestions:         []string{},
 		UnresponsiveEngines: [][2]string{},
 	}, nil
 }
-