feat(meta,core,app,android,ios): cast and trailer

AniList's fragment now asks for the first ten characters, main roles
first, with their Japanese voice actor, and for the trailer's site and
id. Both are stored in the existing details JSON as TitleDetails.cast and
.trailer with serde defaults, so no migration is needed and details
stored before them still read. The details REVISION goes to 2, so a
stored match is refetched by its id on the next metadata run and the
cast fills in without anyone matching the title again.

The title page shows a Cast row of round portraits with the character's
name over the actor's. Clicking a tile opens the Person browse page for
that actor, which now also admits voice actors, and search counts them
under People and studios. A Trailer button opens the YouTube or
Dailymotion page in the browser; the app itself makes no request to
either, and an unknown site or an id with odd characters gives no link.

crates/pstr-android/src/lib.rs

@@ -545,7 +545,7 @@ pub fn airing_countdown(episode: u32, at: i64, now: i64) -> String {
 }
 
 /// What kind of thing a [`BrowseFacet`] names — `Genre`, `Studio`,
-/// `Director` — for over the heading of its page.
+/// `Person` — for over the heading of its page.
 #[uniffi::export]
 pub fn facet_kind(facet: BrowseFacet) -> String {
     facet.core().kind().to_owned()
@@ -706,6 +706,23 @@ pub struct TitleRecord {
     /// `New`, or `3 new` on a show being watched; see `pstr_core::news`.
     #[uniffi(default = None)]
     pub badge: Option<String>,
+    /// The characters, main ones first, with who voices them.
+    #[uniffi(default = [])]
+    pub cast: Vec<CastRecord>,
+    /// The trailer's page, to open in the browser; see
+    /// `pstr_core::metadata::Trailer::url`.
+    #[uniffi(default = None)]
+    pub trailer_url: Option<String>,
+}
+
+/// One character and who voices them: the shared
+/// `pstr_core::metadata::CastMember`.
+#[derive(Debug, Clone, PartialEq, uniffi::Record)]
+pub struct CastRecord {
+    pub character: String,
+    pub character_image: Option<String>,
+    pub actor: Option<String>,
+    pub actor_image: Option<String>,
 }
 
 /// Playback preferences that outlive one file, one title and one launch.
@@ -3893,6 +3910,21 @@ fn title_record(
         next_airing_at: None,
         on_list: false,
         badge: None,
+        cast: details.map_or_else(Vec::new, |details| {
+            details
+                .cast
+                .iter()
+                .map(|member| CastRecord {
+                    character: member.character.clone(),
+                    character_image: member.character_image.clone(),
+                    actor: member.actor.clone(),
+                    actor_image: member.actor_image.clone(),
+                })
+                .collect()
+        }),
+        trailer_url: details
+            .and_then(|details| details.trailer.as_ref())
+            .and_then(|trailer| trailer.url()),
         franchise: Vec::new(),
         logo_url: metadata.and_then(|found| found.logo_url.clone()),
         runtime: details.and_then(|details| details.runtime),