feat(indexer,backoffice): ajouter warnings dans les stats de job, skip fichiers inaccessibles

- Indexer: ajout du champ `warnings` dans JobStats pour les erreurs
  non-fatales (fichiers inaccessibles, permissions)
- Indexer: skip les fichiers dont le stat échoue au lieu de faire
  crasher tout le scan de la library
- Backoffice: affichage des warnings dans le détail job (summary,
  timeline, Index Statistics) et dans la popin jobs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/backoffice/app/components/JobsIndicator.tsx

@@ -19,6 +19,7 @@ interface Job {
     scanned_files: number;
     indexed_files: number;
     errors: number;
+    warnings: number;
   } | null;
 }
 
@@ -261,8 +262,11 @@ export function JobsIndicator() {
                         {job.stats_json && (
                           <div className="flex items-center gap-3 mt-1.5 text-xs text-muted-foreground">
                             <span>✓ {job.stats_json.indexed_files}</span>
+                            {(job.stats_json.warnings ?? 0) > 0 && (
+                              <span className="text-warning">⚠ {job.stats_json.warnings}</span>
+                            )}
                             {job.stats_json.errors > 0 && (
-                              <span className="text-destructive">⚠ {job.stats_json.errors}</span>
+                              <span className="text-destructive">✕ {job.stats_json.errors}</span>
                             )}
                           </div>
                         )}

apps/backoffice/app/jobs/[id]/page.tsx

@@ -30,6 +30,7 @@ interface JobDetails {
     indexed_files: number;
     removed_files: number;
     errors: number;
+    warnings: number;
   } | null;
   error_opt: string | null;
 }
@@ -182,6 +183,7 @@ export default async function JobDetailPage({ params }: JobDetailPageProps) {
               <span className="ml-2 text-success/80">
                 — {job.stats_json.scanned_files} scanned, {job.stats_json.indexed_files} indexed
                 {job.stats_json.removed_files > 0 && `, ${job.stats_json.removed_files} removed`}
+                {(job.stats_json.warnings ?? 0) > 0 && `, ${job.stats_json.warnings} warnings`}
                 {job.stats_json.errors > 0 && `, ${job.stats_json.errors} errors`}
                 {job.total_files != null && job.total_files > 0 && `, ${job.total_files} thumbnails`}
               </span>
@@ -312,6 +314,7 @@ export default async function JobDetailPage({ params }: JobDetailPageProps) {
                           <span className="text-muted-foreground font-normal ml-1">
                             · {job.stats_json.scanned_files} scanned, {job.stats_json.indexed_files} indexed
                             {job.stats_json.removed_files > 0 && `, ${job.stats_json.removed_files} removed`}
+                            {(job.stats_json.warnings ?? 0) > 0 && `, ${job.stats_json.warnings} warn`}
                           </span>
                         )}
                       </p>
@@ -462,10 +465,11 @@ export default async function JobDetailPage({ params }: JobDetailPageProps) {
               )}
             </CardHeader>
             <CardContent>
-              <div className="grid grid-cols-2 sm:grid-cols-4 gap-4">
+              <div className="grid grid-cols-2 sm:grid-cols-5 gap-4">
                 <StatBox value={job.stats_json.scanned_files} label="Scanned" variant="success" />
                 <StatBox value={job.stats_json.indexed_files} label="Indexed" variant="primary" />
                 <StatBox value={job.stats_json.removed_files} label="Removed" variant="warning" />
+                <StatBox value={job.stats_json.warnings ?? 0} label="Warnings" variant={(job.stats_json.warnings ?? 0) > 0 ? "warning" : "default"} />
                 <StatBox value={job.stats_json.errors} label="Errors" variant={job.stats_json.errors > 0 ? "error" : "default"} />
               </div>
             </CardContent>

apps/backoffice/lib/api.ts

@@ -25,6 +25,7 @@ export type IndexJobDto = {
     indexed_files: number;
     removed_files: number;
     errors: number;
+    warnings: number;
   } | null;
   progress_percent: number | null;
   processed_files: number | null;

apps/indexer/src/job.rs

@@ -292,6 +292,7 @@ pub async fn process_job(
         indexed_files: 0,
         removed_files: 0,
         errors: 0,
+        warnings: 0,
     };
 
     let mut total_processed_count = 0i32;

apps/indexer/src/scanner.rs

@@ -1,4 +1,4 @@
-use anyhow::{Context, Result};
+use anyhow::Result;
 use chrono::{DateTime, Utc};
 use parsers::{detect_format, parse_metadata_fast};
 use serde::Serialize;
@@ -21,6 +21,7 @@ pub struct JobStats {
     pub indexed_files: usize,
     pub removed_files: usize,
     pub errors: usize,
+    pub warnings: usize,
 }
 
 const BATCH_SIZE: usize = 100;
@@ -205,8 +206,14 @@ pub async fn scan_library_discovery(
             .map(|s| s.to_string_lossy().to_string())
             .unwrap_or_else(|| abs_path.clone());
 
-        let metadata = std::fs::metadata(&path)
+        let metadata = match std::fs::metadata(&path) {
-            .with_context(|| format!("cannot stat {}", path.display()))?;
+            Ok(m) => m,
+            Err(e) => {
+                warn!("[SCAN] cannot stat {}, skipping: {}", path.display(), e);
+                stats.warnings += 1;
+                continue;
+            }
+        };
         let mtime: DateTime<Utc> = metadata
             .modified()
             .map(DateTime::<Utc>::from)