refactor(server): bundle worker pipeline into PipelineState

Group the four worker handles (analyze/transcribe x busy/tx) into a
new PipelineState struct with a FromRef<AppState> impl. Convert
heal_orphans_if_idle from a free function with 6 parameters into a
method on PipelineState. The two web handlers (handle_my_cases,
handle_case_detail) now take one State<PipelineState> instead of
four separate State extractors.

The original FromRef impls for AnalyzeBusy/Sender and TranscribeBusy/
Sender remain intact so handlers that need only one of them keep
their narrower signature.

server/src/routes/user_web.rs

@@ -9,14 +9,14 @@ use tracing::{info, warn};
 
 use time::{format_description::well_known::Rfc3339, Date, OffsetDateTime};
 
-use crate::analyze::{recovery as analyze_recovery, AnalyzeSender, ANALYSIS_INPUT_FILE, DOCUMENT_FILE};
+use crate::analyze::{recovery as analyze_recovery, ANALYSIS_INPUT_FILE, DOCUMENT_FILE};
 use crate::auth::AuthenticatedWebUser;
 use crate::case_id::{CaseId, CaseIdPath};
 use crate::config::Config;
 use crate::error::AppError;
 use crate::routes::web::{scan_recordings, RecordingView};
-use crate::transcribe::{recovery as transcribe_recovery, TranscribeSender};
-use crate::{AnalyzeBusy, TranscribeBusy};
+use crate::transcribe::recovery as transcribe_recovery;
+use crate::PipelineState;
 
 struct UserCaseView {
     case_id: String,
@@ -201,42 +201,27 @@ pub(crate) async fn any_document_exists(case_dir: &Path) -> bool {
 /// Self-heal: if a worker is idle but orphans exist on disk for this user,
 /// re-enqueue them. Page-load is the trigger; no cron, no periodic task.
 /// Runs for both pipelines so a page-load on either view cleans both.
-async fn heal_orphans_if_idle(
-    user_root: &Path,
-    slug: &str,
-    analyze_busy: &AnalyzeBusy,
-    analyze_tx: &AnalyzeSender,
-    transcribe_busy: &TranscribeBusy,
-    transcribe_tx: &TranscribeSender,
-) {
-    if !analyze_busy.0.load(Ordering::Acquire) {
-        analyze_recovery::enqueue_pending_for_user(user_root, analyze_tx).await;
-    }
-    if !transcribe_busy.0.load(Ordering::Acquire) {
-        transcribe_recovery::enqueue_pending_for_user(user_root, slug, transcribe_tx).await;
+impl PipelineState {
+    pub async fn heal_orphans_if_idle(&self, user_root: &Path, slug: &str) {
+        if !self.analyze_busy.0.load(Ordering::Acquire) {
+            analyze_recovery::enqueue_pending_for_user(user_root, &self.analyze_tx).await;
+        }
+        if !self.transcribe_busy.0.load(Ordering::Acquire) {
+            transcribe_recovery::enqueue_pending_for_user(user_root, slug, &self.transcribe_tx)
+                .await;
+        }
     }
 }
 
 pub async fn handle_my_cases(
     user: AuthenticatedWebUser,
     State(config): State<Arc<Config>>,
-    State(analyze_busy): State<AnalyzeBusy>,
-    State(analyze_tx): State<AnalyzeSender>,
-    State(transcribe_busy): State<TranscribeBusy>,
-    State(transcribe_tx): State<TranscribeSender>,
+    State(pipeline): State<PipelineState>,
 ) -> Result<Html<String>, AppError> {
     let user_root = config.data_path.join(&user.slug);
-    heal_orphans_if_idle(
-        &user_root,
-        &user.slug,
-        &analyze_busy,
-        &analyze_tx,
-        &transcribe_busy,
-        &transcribe_tx,
-    )
-    .await;
+    pipeline.heal_orphans_if_idle(&user_root, &user.slug).await;
 
-    let busy = analyze_busy.0.load(Ordering::Acquire);
+    let busy = pipeline.analyze_busy.0.load(Ordering::Acquire);
     let cases = scan_user_cases(&config, &user.slug, busy).await;
     let total = cases.len();
     let groups = group_by_utc_date(cases);
@@ -260,23 +245,12 @@ pub async fn handle_my_cases(
 pub async fn handle_case_detail(
     user: AuthenticatedWebUser,
     State(config): State<Arc<Config>>,
-    State(analyze_busy): State<AnalyzeBusy>,
-    State(analyze_tx): State<AnalyzeSender>,
-    State(transcribe_busy): State<TranscribeBusy>,
-    State(transcribe_tx): State<TranscribeSender>,
+    State(pipeline): State<PipelineState>,
     CaseIdPath(case_id): CaseIdPath,
 ) -> Result<Html<String>, AppError> {
     // IDOR guard: case_dir must live under the session's user_slug.
     let user_root = config.data_path.join(&user.slug);
-    heal_orphans_if_idle(
-        &user_root,
-        &user.slug,
-        &analyze_busy,
-        &analyze_tx,
-        &transcribe_busy,
-        &transcribe_tx,
-    )
-    .await;
+    pipeline.heal_orphans_if_idle(&user_root, &user.slug).await;
 
     let case_dir = locate_case_or_404(
         &user_root,
@@ -295,8 +269,8 @@ pub async fn handle_case_detail(
         .map(|s| s.trim().to_string())
         .filter(|s| !s.is_empty());
 
-    let a_busy = analyze_busy.0.load(Ordering::Acquire);
-    let t_busy = transcribe_busy.0.load(Ordering::Acquire);
+    let a_busy = pipeline.analyze_busy.0.load(Ordering::Acquire);
+    let t_busy = pipeline.transcribe_busy.0.load(Ordering::Acquire);
     let flags = compute_flags(&case_dir, &recordings, config.llm_configured(), a_busy).await;
     let case_id_short = case_id_str.chars().take(8).collect();
     let is_admin = user.is_admin();