feat: manga collections (0.17.0)

User-owned named lists of mangas with an add-to-collection modal on
the manga page and dedicated /collections and /collections/:id pages.

- Schema (0010): `collections` (per-user case-insensitive name
  uniqueness) + `collection_mangas` join with cascade FKs.
- Endpoints: full CRUD on `/v1/collections`, idempotent add/remove
  for `/v1/collections/:id/mangas`, and `/v1/mangas/:id/my-collections`
  for the modal's pre-checked state. Owner-mismatch surfaces as 404
  (not 403) so the API doesn't disclose collection existence to
  non-owners; the frontend funnels 401 to /login. Three-state PATCH
  via a new shared `domain::patch::Patch<T>` lets clients distinguish
  "leave alone", "clear", and "set" for description.
- Frontend: reusable `Modal` component (focus trap, opt-in
  backdrop close, ESC) and `AddToCollectionModal` with optimistic
  toggling that's race-safe under fast clicks. /collections page
  renders cover-collage cards; /collections/:id is editable with
  per-card remove. Top nav gets a Collections link.

155 backend tests (incl. 21 collection tests covering ownership,
idempotence, sample-cover enrichment, three-state PATCH, FK race);
88 frontend tests; svelte-check clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/src/domain/collection.rs

@@ -0,0 +1,50 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use sqlx::FromRow;
+use uuid::Uuid;
+
+use super::patch::Patch;
+
+#[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+pub struct Collection {
+    pub id: Uuid,
+    pub user_id: Uuid,
+    pub name: String,
+    pub description: Option<String>,
+    pub created_at: DateTime<Utc>,
+    pub updated_at: DateTime<Utc>,
+}
+
+/// Shape returned by `GET /me/collections`. Enriched with the manga
+/// count and up to three sample cover paths so a collection card can
+/// render without extra round-trips.
+#[derive(Debug, Clone, Serialize, FromRow)]
+pub struct CollectionSummary {
+    pub id: Uuid,
+    pub user_id: Uuid,
+    pub name: String,
+    pub description: Option<String>,
+    pub created_at: DateTime<Utc>,
+    pub updated_at: DateTime<Utc>,
+    pub manga_count: i64,
+    /// Cover image keys of up to three sample mangas (newest-added
+    /// first). `Vec<String>` rather than `Option<...>` so an empty
+    /// collection renders as `[]` rather than `null`.
+    pub sample_covers: Vec<String>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct NewCollection {
+    pub name: String,
+    #[serde(default)]
+    pub description: Option<String>,
+}
+
+#[derive(Debug, Clone, Deserialize, Default)]
+pub struct CollectionPatch {
+    pub name: Option<String>,
+    /// Three-state: missing key leaves description alone; explicit
+    /// `null` clears it; a string sets it. See `Patch`.
+    #[serde(default)]
+    pub description: Patch<String>,
+}

backend/src/domain/manga.rs

@@ -5,6 +5,7 @@ use uuid::Uuid;
 
 use super::author::AuthorRef;
 use super::genre::GenreRef;
+use super::patch::Patch;
 use super::tag::TagRef;
 
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
@@ -73,82 +74,6 @@ pub struct MangaPatch {
     pub genre_ids: Option<Vec<Uuid>>,
 }
 
-/// Three-state container for nullable PATCH fields.
-///
-/// `serde`'s default behaviour collapses both "field missing" and
-/// "field is `null`" to `Option::None`, which means an `Option<T>`
-/// patch field can't distinguish "leave alone" from "set to NULL".
-/// `Patch<T>` carries that distinction by deserializing JSON `null`
-/// into `Clear` and any value into `Set`; with `#[serde(default)]` on
-/// the field, a missing key falls through to `Unchanged`.
-#[derive(Debug, Clone, Default, PartialEq, Eq)]
-pub enum Patch<T> {
-    /// Field absent from the request — leave the column untouched.
-    #[default]
-    Unchanged,
-    /// Field present and explicitly `null` — set the column to NULL.
-    Clear,
-    /// Field present with a value — set the column to that value.
-    Set(T),
-}
-
-impl<T> Patch<T> {
-    /// Whether the request indicated this field should be written
-    /// (either to a new value or to NULL).
-    pub fn is_provided(&self) -> bool {
-        !matches!(self, Patch::Unchanged)
-    }
-
-    /// The value to bind when writing, or `None` for `Unchanged`/`Clear`.
-    pub fn set_value(&self) -> Option<&T> {
-        match self {
-            Patch::Set(v) => Some(v),
-            _ => None,
-        }
-    }
-}
-
-impl<'de, T> serde::Deserialize<'de> for Patch<T>
-where
-    T: serde::Deserialize<'de>,
-{
-    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
-    where
-        D: serde::Deserializer<'de>,
-    {
-        Option::<T>::deserialize(deserializer).map(|opt| match opt {
-            Some(v) => Patch::Set(v),
-            None => Patch::Clear,
-        })
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use serde_json::json;
-
-    #[derive(Deserialize)]
-    struct Holder {
-        #[serde(default)]
-        desc: Patch<String>,
-    }
-
-    #[test]
-    fn missing_key_is_unchanged() {
-        let h: Holder = serde_json::from_value(json!({})).unwrap();
-        assert_eq!(h.desc, Patch::Unchanged);
-    }
-
-    #[test]
-    fn explicit_null_is_clear() {
-        let h: Holder = serde_json::from_value(json!({ "desc": null })).unwrap();
-        assert_eq!(h.desc, Patch::Clear);
-    }
-
-    #[test]
-    fn value_is_set() {
-        let h: Holder = serde_json::from_value(json!({ "desc": "x" })).unwrap();
-        assert_eq!(h.desc, Patch::Set("x".into()));
-    }
-}
+// `Patch<T>` lives in `super::patch` so other resources (collections,
+// future PATCH endpoints) can reuse the same three-state semantics
+// without re-importing through `manga::`.

backend/src/domain/mod.rs

@@ -2,9 +2,11 @@ pub mod api_token;
 pub mod author;
 pub mod bookmark;
 pub mod chapter;
+pub mod collection;
 pub mod genre;
 pub mod manga;
 pub mod page;
+pub mod patch;
 pub mod session;
 pub mod tag;
 pub mod user;
@@ -14,9 +16,11 @@ pub use api_token::ApiToken;
 pub use author::{Author, AuthorRef, AuthorWithCount};
 pub use bookmark::{Bookmark, BookmarkSummary};
 pub use chapter::Chapter;
+pub use collection::{Collection, CollectionSummary};
 pub use genre::{Genre, GenreRef};
 pub use manga::{Manga, MangaCard, MangaDetail};
 pub use page::Page;
+pub use patch::Patch;
 pub use session::Session;
 pub use tag::{Tag, TagRef};
 pub use user::User;

backend/src/domain/patch.rs

@@ -0,0 +1,81 @@
+//! Three-state container for PATCH fields.
+//!
+//! `serde`'s default behaviour collapses both "field missing" and
+//! "field is `null`" to `Option::None`, which means an `Option<T>`
+//! patch field can't distinguish "leave alone" from "set to NULL".
+//! `Patch<T>` carries that distinction by deserializing JSON `null`
+//! into `Clear` and any value into `Set`; with `#[serde(default)]`
+//! on the field, a missing key falls through to `Unchanged`.
+
+#[derive(Debug, Clone, Default, PartialEq, Eq)]
+pub enum Patch<T> {
+    /// Field absent from the request — leave the column untouched.
+    #[default]
+    Unchanged,
+    /// Field present and explicitly `null` — set the column to NULL.
+    Clear,
+    /// Field present with a value — set the column to that value.
+    Set(T),
+}
+
+impl<T> Patch<T> {
+    /// Whether the request indicated this field should be written
+    /// (either to a new value or to NULL).
+    pub fn is_provided(&self) -> bool {
+        !matches!(self, Patch::Unchanged)
+    }
+
+    /// The value to bind when writing, or `None` for `Unchanged`/`Clear`.
+    pub fn set_value(&self) -> Option<&T> {
+        match self {
+            Patch::Set(v) => Some(v),
+            _ => None,
+        }
+    }
+}
+
+impl<'de, T> serde::Deserialize<'de> for Patch<T>
+where
+    T: serde::Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        Option::<T>::deserialize(deserializer).map(|opt| match opt {
+            Some(v) => Patch::Set(v),
+            None => Patch::Clear,
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde::Deserialize;
+    use serde_json::json;
+
+    #[derive(Deserialize)]
+    struct Holder {
+        #[serde(default)]
+        desc: Patch<String>,
+    }
+
+    #[test]
+    fn missing_key_is_unchanged() {
+        let h: Holder = serde_json::from_value(json!({})).unwrap();
+        assert_eq!(h.desc, Patch::Unchanged);
+    }
+
+    #[test]
+    fn explicit_null_is_clear() {
+        let h: Holder = serde_json::from_value(json!({ "desc": null })).unwrap();
+        assert_eq!(h.desc, Patch::Clear);
+    }
+
+    #[test]
+    fn value_is_set() {
+        let h: Holder = serde_json::from_value(json!({ "desc": "x" })).unwrap();
+        assert_eq!(h.desc, Patch::Set("x".into()));
+    }
+}