feat(enhance): discard, tests against a mock ComfyUI, docs (#192)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/enhance/handlers.rs

@@ -180,11 +180,7 @@ fn resolve_file(
 
 /// Library and relative path of an absolute file ComfyUI wrote. The job's own
 /// library wins when roots overlap.
-fn place_in_libraries(
-    libs: &[Library],
-    prefer: i32,
-    abs: &Path,
-) -> Option<(i32, String)> {
+fn place_in_libraries(libs: &[Library], prefer: i32, abs: &Path) -> Option<(i32, String)> {
     let mut ordered: Vec<&Library> = libs.iter().collect();
     ordered.sort_by_key(|l| l.id != prefer);
     for lib in ordered {
@@ -292,10 +288,16 @@ pub async fn submit(
         Ok(f) => f,
         Err(r) => return r,
     };
-    let reference = match body.reference_path.as_deref().filter(|p| !p.trim().is_empty()) {
+    let reference = match body
+        .reference_path
+        .as_deref()
+        .filter(|p| !p.trim().is_empty())
+    {
         Some(p) => {
             // The reference lives in the photo's own library.
-            let lib = app_state.library_by_id(photo.library_id).map(|l| l.name.clone());
+            let lib = app_state
+                .library_by_id(photo.library_id)
+                .map(|l| l.name.clone());
             match resolve_file(&app_state, &exif_dao, p, lib.as_deref()) {
                 Ok(f) => Some(f),
                 Err(r) => return r,
@@ -304,7 +306,12 @@ pub async fn submit(
         None => None,
     };
     match svc
-        .submit(&photo, &body.template, body.prompt.as_deref(), reference.as_ref())
+        .submit(
+            &photo,
+            &body.template,
+            body.prompt.as_deref(),
+            reference.as_ref(),
+        )
         .await
     {
         Ok(job) => HttpResponse::Ok().json(job_view(&job)),
@@ -442,10 +449,8 @@ pub async fn approve(
     let version_dao = app_state.version_dao.clone();
     let exif_arc: Arc<Mutex<Box<dyn ExifDao>>> = exif_dao.clone().into_inner();
     let (lib2, rel2, abs2) = (library.clone(), rel.clone(), abs.clone());
-    let ingested = web::block(move || {
-        ingest_saved(&lib2, &rel2, &abs2, &exif_arc, &version_dao)
-    })
-    .await;
+    let ingested =
+        web::block(move || ingest_saved(&lib2, &rel2, &abs2, &exif_arc, &version_dao)).await;
     let hash = match ingested {
         Ok(Some(h)) => h,
         _ => {
@@ -461,7 +466,10 @@ pub async fn approve(
 
     // Which version row did that become?
     let entry = {
-        let mut dao = app_state.version_dao.lock().expect("Unable to lock VersionDao");
+        let mut dao = app_state
+            .version_dao
+            .lock()
+            .expect("Unable to lock VersionDao");
         let original = match dao.get_link(&hash) {
             Ok(Some(link)) => link.original_hash,
             _ => job.original_hash.clone(),