Improve Twitter/X link handling and text formatting

- Use FxTwitter API for full note tweet text (with syndication API fallback)
- Save Twitter posts based on media content:
  - Videos → embed type (proxied video)
  - Images → image type (gallery)
  - Text-only → quote type
- Add granular preview badges: 'X VIDEO', 'X GALLERY', 'X POST'
- Preserve formatting/spacing with white-space: pre-wrap for quotes and descriptions
- Rename VideoInfo to EmbedInfo for better semantic clarity

internal/handlers/api_upload.go

@@ -96,22 +96,24 @@ type urlMetadata struct {
 	VideoID     string
 	EmbedHTML   string
 	VideoURL    string // Direct video URL (for Twitter)
+	MediaType   string // "video", "images", "text" - for Twitter only
 }
 
 func fetchURLMetadata(ctx context.Context, url string) (*urlMetadata, error) {
 	// Check if it's a YouTube/Vimeo/Twitter embed
-	videoInfo, err := embed.Detect(ctx, url)
-	if err == nil && videoInfo != nil {
+	embedInfo, err := embed.Detect(ctx, url)
+	if err == nil && embedInfo != nil {
 		return &urlMetadata{
-			Title:       videoInfo.Title,
-			Description: videoInfo.Description,
-			ImageURL:    videoInfo.ThumbnailURL,
-			ImageURLs:   videoInfo.ThumbnailURLs,
+			Title:       embedInfo.Title,
+			Description: embedInfo.Description,
+			ImageURL:    embedInfo.ThumbnailURL,
+			ImageURLs:   embedInfo.ThumbnailURLs,
 			IsEmbed:     true,
-			Provider:    string(videoInfo.Provider),
-			VideoID:     videoInfo.VideoID,
-			EmbedHTML:   videoInfo.EmbedHTML,
-			VideoURL:    videoInfo.VideoURL,
+			Provider:    string(embedInfo.Provider),
+			VideoID:     embedInfo.VideoID,
+			EmbedHTML:   embedInfo.EmbedHTML,
+			VideoURL:    embedInfo.VideoURL,
+			MediaType:   embedInfo.MediaType,
 		}, nil
 	}
 
@@ -139,6 +141,7 @@ type previewResponse struct {
 	Provider    string `json:"provider,omitempty"`
 	VideoID     string `json:"videoId,omitempty"`
 	EmbedHTML   string `json:"embedHtml,omitempty"`
+	MediaType   string `json:"mediaType,omitempty"` // "video", "images", "text" - for Twitter
 }
 
 // HandlePreviewLink handles POST /api/preview - fetches metadata for a URL
@@ -175,6 +178,7 @@ func HandlePreviewLink(rc *RequestContext, w http.ResponseWriter, r *http.Reques
 		Provider:    meta.Provider,
 		VideoID:     meta.VideoID,
 		EmbedHTML:   meta.EmbedHTML,
+		MediaType:   meta.MediaType,
 	})
 }
 
@@ -207,35 +211,58 @@ func HandleCreateFromLink(rc *RequestContext, w http.ResponseWriter, r *http.Req
 
 	var itemType string
 	var embedProvider, embedVideoID, embedHTML *string
+	var imageURL, videoURL string
+	var imageURLs []string // For multi-image tweets
 
 	if req.Provider != nil && *req.Provider != "" {
-		// It's an embed
-		itemType = "embed"
-		embedProvider = req.Provider
-		embedVideoID = req.VideoID
-		embedHTML = req.EmbedHTML
+		// Special handling for Twitter based on media content
+		if *req.Provider == "twitter" {
+			// Fetch tweet info to determine content type
+			videoInfo, err := embed.Detect(ctx, req.URL)
+			if err == nil && videoInfo != nil {
+				if videoInfo.VideoURL != "" {
+					// Tweet has video → keep as embed (proxied)
+					itemType = "embed"
+					embedProvider = req.Provider
+					embedVideoID = req.VideoID
+					embedHTML = req.EmbedHTML
+					videoURL = videoInfo.VideoURL
+					imageURL = videoInfo.ThumbnailURL
+				} else if len(videoInfo.ThumbnailURLs) > 0 {
+					// Tweet has image(s) → save as image
+					itemType = "image"
+					imageURL = videoInfo.ThumbnailURL
+					imageURLs = videoInfo.ThumbnailURLs
+				} else {
+					// Text-only tweet → save as quote
+					itemType = "quote"
+					// title and description already set from request
+				}
+			} else {
+				// If detection fails, fall back to link
+				itemType = "link"
+			}
+		} else {
+			// YouTube, Vimeo, etc. → keep as embed
+			itemType = "embed"
+			embedProvider = req.Provider
+			embedVideoID = req.VideoID
+			embedHTML = req.EmbedHTML
+			// Fetch thumbnail for non-Twitter embeds
+			if videoInfo, err := embed.Detect(ctx, req.URL); err == nil && videoInfo != nil {
+				imageURL = videoInfo.ThumbnailURL
+				videoURL = videoInfo.VideoURL
+			}
+		}
 	} else if req.ImageURL != nil && *req.ImageURL != "" {
 		// It's a link with an image
 		itemType = "image"
+		imageURL = *req.ImageURL
 	} else {
 		// Just a link (will be shown as a card)
 		itemType = "link"
 	}
 
-	// For embeds, fetch thumbnail(s) and video URL
-	var imageURL, videoURL string
-	var imageURLs []string // For multi-image tweets
-	if req.ImageURL != nil {
-		imageURL = *req.ImageURL
-	}
-	if itemType == "embed" && embedProvider != nil {
-		if videoInfo, err := embed.Detect(ctx, req.URL); err == nil && videoInfo != nil {
-			imageURL = videoInfo.ThumbnailURL
-			imageURLs = videoInfo.ThumbnailURLs
-			videoURL = videoInfo.VideoURL
-		}
-	}
-
 	// Create the item
 	it, err := item.QCreate(ctx, rc.DB, item.CreateParams{
 		Title:         item.Nullable(req.Title),