feat(tickets): filtres multi-critères par cases à cocher (backend + frontend)

Passe les filtres de la liste des tickets en sélection multiple (#12).

Backend Rust :
- IssueListFilter : statuses/priorities en Vec, filter_matches en OR intra-champ
  et AND inter-champs
- TicketListRequestDto en tableaux + from_request (parse/déduplication)
- MCP idea_ticket_list aligné sur le nouveau contrat

Frontend :
- TicketListQuery.statuses/priorities
- UI de cases à cocher, toggle/clear des filtres

Tests verts : issue_store (7), app-tauri --lib (59), mcp_server (24),
issue_usecases (6), sprint_usecases (6), frontend vitest (505), npm run build (exit 0).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/infrastructure/src/issues.rs

@@ -231,13 +231,10 @@ async fn write_index(root: &ProjectPath, rows: &[IssueIndexEntry]) -> Result<(),
 }
 
 fn filter_matches(row: &IssueIndexEntry, filter: &IssueListFilter) -> bool {
-    if filter.status.is_some_and(|status| row.status != status) {
+    if !filter.statuses.is_empty() && !filter.statuses.contains(&row.status) {
         return false;
     }
-    if filter
-        .priority
-        .is_some_and(|priority| row.priority != priority)
-    {
+    if !filter.priorities.is_empty() && !filter.priorities.contains(&row.priority) {
         return false;
     }
     if let Some(agent_id) = filter.assigned_agent_id {

crates/infrastructure/src/orchestrator/mcp/tickets.rs

@@ -125,8 +125,16 @@ pub fn catalogue() -> Vec<ToolDef> {
             input_schema: json!({
                 "type": "object",
                 "properties": {
-                    "status": status.clone(),
-                    "priority": priority.clone(),
+                    "statuses": {
+                        "type": "array",
+                        "items": status.clone(),
+                        "uniqueItems": true
+                    },
+                    "priorities": {
+                        "type": "array",
+                        "items": priority.clone(),
+                        "uniqueItems": true
+                    },
                     "assignedAgentId": { "type": "string", "format": "uuid" },
                     "text": { "type": "string" },
                     "limit": { "type": "integer", "minimum": 1 },

crates/infrastructure/tests/issue_store.rs

@@ -112,7 +112,7 @@ async fn issue_store_update_checks_expected_version() {
 }
 
 #[tokio::test]
-async fn issue_store_lists_by_index_filters() {
+async fn issue_store_lists_by_index_filters_with_empty_or_and_and_semantics() {
     let tmp = TempDir::new();
     let root = tmp.root();
     let store = FsIssueStore::new();
@@ -127,21 +127,61 @@ async fn issue_store_lists_by_index_filters() {
         })
         .unwrap();
     store.create(&root, &closed).await.unwrap();
+    let qa_high = issue(&root, 3, "Gamma")
+        .mutate(IssueActor::System, 3_000, |i| {
+            i.status = IssueStatus::Qa;
+            i.priority = IssuePriority::Critical;
+        })
+        .unwrap();
+    store.create(&root, &qa_high).await.unwrap();
 
-    let rows = store
+    let all = store.list(&root, IssueListFilter::default()).await.unwrap();
+    assert_eq!(all.len(), 3);
+
+    let by_status_or = store
         .list(
             &root,
             IssueListFilter {
-                status: Some(IssueStatus::Closed),
-                priority: Some(IssuePriority::Low),
+                statuses: vec![IssueStatus::Closed, IssueStatus::Qa],
                 ..IssueListFilter::default()
             },
         )
         .await
         .unwrap();
 
-    assert_eq!(rows.len(), 1);
-    assert_eq!(rows[0].title, "Beta");
+    assert_eq!(by_status_or.len(), 2);
+    assert_eq!(by_status_or[0].title, "Beta");
+    assert_eq!(by_status_or[1].title, "Gamma");
+
+    let by_priority_or = store
+        .list(
+            &root,
+            IssueListFilter {
+                priorities: vec![IssuePriority::Low, IssuePriority::Critical],
+                ..IssueListFilter::default()
+            },
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(by_priority_or.len(), 2);
+    assert_eq!(by_priority_or[0].title, "Beta");
+    assert_eq!(by_priority_or[1].title, "Gamma");
+
+    let by_status_and_priority = store
+        .list(
+            &root,
+            IssueListFilter {
+                statuses: vec![IssueStatus::Closed, IssueStatus::Qa],
+                priorities: vec![IssuePriority::Low],
+                ..IssueListFilter::default()
+            },
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(by_status_and_priority.len(), 1);
+    assert_eq!(by_status_and_priority[0].title, "Beta");
 }
 
 #[tokio::test]