refactor(x-media): drop Media's write-only title field

Every adapter set title (mostly None) on all three Media variants and
nothing ever read it: the bot's CachedMedia carries kind/file_id/url, and the
one read was misskey's own test. Removing it also drops misskey's
DriveFile.name, which existed only to feed it. Fetched::title (the post's
own headline, which captions do use) is untouched.

crates/x-media/src/media.rs

@@ -37,18 +37,15 @@ impl Media {
 #[derive(Debug)]
 pub enum Media {
     Illustration {
-        title: Option<String>,
         url: String,
         thumbnail_url: Option<String>,
         fallback_url: Option<String>,
     },
     Video {
-        title: Option<String>,
         url: String,
         thumbnail_url: String,
     },
     Animated {
-        title: Option<String>,
         url: String,
         thumbnail_url: String,
     },

crates/x-media/src/site/bilibili/interface.rs

@@ -458,7 +458,6 @@ fn image(url: &str) -> Option<Media> {
     }
     Some(if url.ends_with(".gif") {
         Media::Animated {
-            title: None,
             url,
             // Left empty on purpose: the `@518w.jpg` variant is unverified for
             // animated sources, and Telegram generates a frame preview itself.
@@ -466,7 +465,6 @@ fn image(url: &str) -> Option<Media> {
         }
     } else {
         Media::Illustration {
-            title: None,
             // Written before `url` moves so the formatting borrows it.
             thumbnail_url: Some(format!("{url}{THUMB_SUFFIX}")),
             url,

crates/x-media/src/site/bsky/interface.rs

@@ -73,7 +73,6 @@ pub async fn fetch_from_url(url: &str) -> Result<Fetched, FetchError> {
                     _ => String::new(),
                 };
                 media.push(Media::Video {
-                    title: None,
                     url: mp4_path.to_string_lossy().into_owned(),
                     thumbnail_url,
                 });
@@ -354,7 +353,6 @@ impl Post {
                     match embed {
                         model::Media::Images { images } => {
                             media.extend(images.into_iter().map(|image| Media::Illustration {
-                                title: None,
                                 url: image.fullsize,
                                 thumbnail_url: Some(image.thumb),
                                 fallback_url: None,
@@ -365,7 +363,6 @@ impl Post {
                             thumbnail,
                         } => {
                             media.push(Media::Video {
-                                title: None,
                                 url: playlist,
                                 thumbnail_url: thumbnail,
                             });

crates/x-media/src/site/misskey/interface.rs

@@ -160,21 +160,17 @@ fn caption(url: &str, author_url: &str, author: &str, text: &str) -> String {
 /// are skipped (twitter's `_ => {}` precedent). GIF must be matched before
 /// the generic image arm.
 fn media_from_file(file: &model::DriveFile) -> Option<Media> {
-    let title = file.name.clone();
     match file.mime_type.as_str() {
         "image/gif" => Some(Media::Animated {
-            title,
             url: file.url.clone(),
             thumbnail_url: file.thumbnail_url.clone().unwrap_or_default(),
         }),
         mime if mime.starts_with("image/") => Some(Media::Illustration {
-            title,
             url: file.url.clone(),
             thumbnail_url: file.thumbnail_url.clone(),
             fallback_url: None,
         }),
         mime if mime.starts_with("video/") => Some(Media::Video {
-            title,
             url: file.url.clone(),
             thumbnail_url: file.thumbnail_url.clone().unwrap_or_default(),
         }),
@@ -253,12 +249,10 @@ mod tests {
         assert_eq!(fetched.media.len(), 1);
         match &fetched.media[0] {
             Media::Illustration {
-                title,
                 url,
                 thumbnail_url,
                 fallback_url,
             } => {
-                assert_eq!(title.as_deref(), Some("pic.webp"));
                 assert_eq!(url, "https://media.misskeyusercontent.jp/io/a.webp");
                 assert_eq!(
                     thumbnail_url.as_deref(),

crates/x-media/src/site/misskey/model.rs

@@ -30,6 +30,4 @@ pub(crate) struct DriveFile {
     pub(crate) thumbnail_url: Option<String>,
     #[serde(default, rename = "isSensitive")]
     pub(crate) is_sensitive: bool,
-    #[serde(default)]
-    pub(crate) name: Option<String>,
 }

crates/x-media/src/site/pixiv/api.rs

@@ -149,7 +149,6 @@ impl PixivAPI {
             match self.ugoira_video(illust_id).await {
                 Ok(Some((mp4_path, _keep_alive))) => {
                     illustration.media.push(Media::Video {
-                        title: None,
                         url: mp4_path,
                         thumbnail_url: model.image_urls.medium.clone(),
                     });

crates/x-media/src/site/pixiv/interface.rs

@@ -235,7 +235,6 @@ impl Illustration {
                     .original
                     .clone()
                     .map(|original| Media::Illustration {
-                        title: None,
                         url: original,
                         thumbnail_url: Some(page.image_urls.medium.clone()),
                         fallback_url: Some(page.image_urls.large.clone()),
@@ -248,7 +247,6 @@ impl Illustration {
             .or(model.image_urls.original.clone())
         {
             media.push(Media::Illustration {
-                title: None,
                 url: original,
                 thumbnail_url: Some(model.image_urls.medium.clone()),
                 fallback_url: Some(model.image_urls.large.clone()),

crates/x-media/src/site/twitter/interface.rs

@@ -236,7 +236,6 @@ impl Tweet {
         for item in json.media_details {
             match item.media_type.as_str() {
                 "photo" => media.push(Media::Illustration {
-                    title: None,
                     url: original_twimg_url(&item.media_url_https),
                     thumbnail_url: None,
                     // The param-less base URL is a reduced-size variant;
@@ -244,12 +243,10 @@ impl Tweet {
                     fallback_url: Some(item.media_url_https.clone()),
                 }),
                 "video" => media.push(Media::Video {
-                    title: None,
                     url: mp4_variant(&item),
                     thumbnail_url: item.media_url_https,
                 }),
                 "animated_gif" => media.push(Media::Animated {
-                    title: None,
                     url: mp4_variant(&item),
                     thumbnail_url: item.media_url_https,
                 }),

crates/xmedia-bot/src/handlers/commands.rs

@@ -816,13 +816,11 @@ mod tests {
     fn debug_report_renders_fields_and_media() {
         let media = vec![
             Media::Illustration {
-                title: None,
                 url: "https://cdn.example/1.jpg".into(),
                 thumbnail_url: None,
                 fallback_url: None,
             },
             Media::Video {
-                title: None,
                 url: "https://cdn.example/2.mp4".into(),
                 thumbnail_url: "https://cdn.example/2.jpg".into(),
             },
@@ -915,7 +913,6 @@ mod tests {
         // 200 media lines ≈ 8 KB, comfortably over the cap.
         let media: Vec<Media> = (0..200)
             .map(|i| Media::Illustration {
-                title: None,
                 url: format!("https://cdn.example/{i}.jpg"),
                 thumbnail_url: None,
                 fallback_url: None,