Refactor case detail into a dedicated page

This commit restructures the web interface for case details. The
previous `/web/cases/{case_id}` route, which previously showed both the
case summary and its recordings, has been split into two distinct pages:

- `/web/cases/{case_id}`: This page now displays the overall case
  information, including the document if available.
- `/web/cases/{case_id}/recordings`: This new page is dedicated to
  listing and displaying individual recordings within a case.

This change improves the organization and clarity of the web UI,
allowing for more focused views of case data. Additionally, the
`case_detail.html` and `document.html` templates have been removed as
their functionality is now handled by the new `case_page.html` and the
upcoming document rendering logic. The `cases.html` template has also
been removed, indicating a shift towards more granular page views.

server/src/routes/user_web.rs

@@ -125,31 +125,9 @@ struct MyCasesTemplate {
     is_admin: bool,
 }
 
-#[derive(Template)]
-#[template(path = "case_detail.html")]
-struct CaseDetailTemplate {
-    slug: String,
-    case_id: String,
-    case_id_short: String,
-    oneliner: Option<String>,
-    recordings: Vec<RecordingView>,
-    can_analyze: bool,
-    llm_missing: bool,
-    analyzing: bool,
-    has_document: bool,
-    /// True iff the transcribe worker is currently running. Gate for the
-    /// per-recording "Transkription läuft…" label — suppresses the lie when
-    /// a transcript is missing but no worker is active.
-    transcribe_busy: bool,
-    /// True iff the session user is an admin — toggles admin-only controls
-    /// (currently the Reset button).
-    is_admin: bool,
-}
-
 #[derive(Template)]
 #[template(path = "case_page.html")]
 struct CasePageTemplate {
-    slug: String,
     case_id: String,
     case_id_short: String,
     oneliner: Option<String>,
@@ -175,7 +153,6 @@ struct CaseRecordingsTemplate {
     oneliner: Option<String>,
     recordings: Vec<RecordingView>,
     transcribe_busy: bool,
-    is_admin: bool,
 }
 
 /// Flags derived from filesystem state + config.
@@ -275,57 +252,6 @@ pub async fn handle_my_cases(
     .map_err(|e| AppError::Internal(format!("Template render failed: {e}")))
 }
 
-pub async fn handle_case_detail(
-    user: AuthenticatedWebUser,
-    State(config): State<Arc<Config>>,
-    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);
-    pipeline.heal_orphans_if_idle(&user_root, &user.slug).await;
-
-    let case_dir = locate_case_or_404(
-        &user_root,
-        &case_id,
-        &user.slug,
-        "case detail (possible IDOR probe)",
-    )
-    .await?;
-    let case_id_str = case_id.to_string();
-    info!(slug = %user.slug, case_id = %case_id, "case detail viewed");
-
-    let recordings = scan_recordings(&case_dir).await;
-    let oneliner = tokio::fs::read_to_string(case_dir.join("oneliner.txt"))
-        .await
-        .ok()
-        .map(|s| s.trim().to_string())
-        .filter(|s| !s.is_empty());
-
-    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();
-
-    CaseDetailTemplate {
-        slug: user.slug,
-        case_id: case_id_str,
-        case_id_short,
-        oneliner,
-        recordings,
-        can_analyze: flags.can_analyze,
-        llm_missing: flags.llm_missing,
-        analyzing: flags.analyzing,
-        has_document: flags.has_document,
-        transcribe_busy: t_busy,
-        is_admin,
-    }
-    .render()
-    .map(Html)
-    .map_err(|e| AppError::Internal(format!("Template render failed: {e}")))
-}
-
 /// GET /web/cases/{case_id}
 ///
 /// Canonical case page. Renders the document inline if present; otherwise
@@ -374,7 +300,6 @@ pub async fn handle_case_page(
     let is_admin = user.is_admin();
 
     CasePageTemplate {
-        slug: user.slug,
         case_id: case_id_str,
         case_id_short,
         oneliner,
@@ -424,7 +349,6 @@ pub async fn handle_case_recordings(
 
     let t_busy = pipeline.transcribe_busy.0.load(Ordering::Acquire);
     let case_id_short = case_id_str.chars().take(8).collect();
-    let is_admin = user.is_admin();
 
     CaseRecordingsTemplate {
         slug: user.slug,
@@ -433,7 +357,6 @@ pub async fn handle_case_recordings(
         oneliner,
         recordings,
         transcribe_busy: t_busy,
-        is_admin,
     }
     .render()
     .map(Html)