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/app-tauri/src/tickets.rs

@@ -195,8 +195,10 @@ pub struct TicketDeleteRequestDto {
 pub struct TicketListRequestDto {
     #[serde(default)]
     pub project_id: String,
-    pub status: Option<String>,
-    pub priority: Option<String>,
+    #[serde(default)]
+    pub statuses: Vec<String>,
+    #[serde(default)]
+    pub priorities: Vec<String>,
     pub assigned_agent_id: Option<String>,
     pub sprint_id: Option<String>,
     pub text: Option<String>,
@@ -1109,6 +1111,7 @@ impl From<IssueCarnet> for TicketCarnetDto {
     }
 }
 
+#[derive(Debug)]
 struct TicketListPageInput {
     filter: IssueListFilter,
     limit: usize,
@@ -1119,16 +1122,8 @@ impl TicketListPageInput {
     fn from_request(request: TicketListRequestDto) -> Result<Self, ErrorDto> {
         Ok(Self {
             filter: IssueListFilter {
-                status: request
-                    .status
-                    .as_deref()
-                    .map(parse_status_dto)
-                    .transpose()?,
-                priority: request
-                    .priority
-                    .as_deref()
-                    .map(parse_priority_dto)
-                    .transpose()?,
+                statuses: parse_statuses_dto(request.statuses)?,
+                priorities: parse_priorities_dto(request.priorities)?,
                 assigned_agent_id: request
                     .assigned_agent_id
                     .as_deref()
@@ -1349,6 +1344,28 @@ fn parse_priority_dto(raw: &str) -> Result<IssuePriority, ErrorDto> {
     parse_priority(raw).map_err(|e| ErrorDto::invalid(e.message))
 }
 
+fn parse_statuses_dto(raw: Vec<String>) -> Result<Vec<IssueStatus>, ErrorDto> {
+    let mut out = Vec::new();
+    for item in raw {
+        let status = parse_status_dto(&item)?;
+        if !out.contains(&status) {
+            out.push(status);
+        }
+    }
+    Ok(out)
+}
+
+fn parse_priorities_dto(raw: Vec<String>) -> Result<Vec<IssuePriority>, ErrorDto> {
+    let mut out = Vec::new();
+    for item in raw {
+        let priority = parse_priority_dto(&item)?;
+        if !out.contains(&priority) {
+            out.push(priority);
+        }
+    }
+    Ok(out)
+}
+
 fn parse_link_kind_dto(raw: &str) -> Result<IssueLinkKind, ErrorDto> {
     parse_link_kind(raw).map_err(|e| ErrorDto::invalid(e.message))
 }
@@ -1524,3 +1541,99 @@ impl ErrorDto {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use domain::IssueNumber;
+
+    #[test]
+    fn ticket_list_request_deduplicates_multi_select_filters() {
+        let page = TicketListPageInput::from_request(TicketListRequestDto {
+            project_id: String::new(),
+            statuses: vec!["open".into(), "closed".into(), "open".into()],
+            priorities: vec!["high".into(), "low".into(), "high".into()],
+            assigned_agent_id: None,
+            sprint_id: None,
+            text: None,
+            limit: None,
+            cursor: None,
+        })
+        .unwrap();
+
+        assert_eq!(
+            page.filter.statuses,
+            vec![IssueStatus::Open, IssueStatus::Closed]
+        );
+        assert_eq!(
+            page.filter.priorities,
+            vec![IssuePriority::High, IssuePriority::Low]
+        );
+    }
+
+    #[test]
+    fn ticket_list_request_rejects_invalid_multi_select_token() {
+        let err = TicketListPageInput::from_request(TicketListRequestDto {
+            project_id: String::new(),
+            statuses: vec!["open".into(), "bad".into()],
+            priorities: Vec::new(),
+            assigned_agent_id: None,
+            sprint_id: None,
+            text: None,
+            limit: None,
+            cursor: None,
+        })
+        .unwrap_err();
+
+        assert_eq!(err.code, "INVALID");
+        assert!(err.message.contains("invalid ticket status: bad"));
+    }
+
+    #[test]
+    fn ticket_list_pagination_preserves_multi_filter_request_shape() {
+        let page = TicketListPageInput::from_request(TicketListRequestDto {
+            project_id: String::new(),
+            statuses: vec!["open".into(), "QA".into()],
+            priorities: vec!["high".into()],
+            assigned_agent_id: None,
+            sprint_id: None,
+            text: None,
+            limit: Some(1),
+            cursor: Some("1".into()),
+        })
+        .unwrap();
+        let rows = vec![
+            issue_row(1, IssueStatus::Open, IssuePriority::High, "Alpha"),
+            issue_row(2, IssueStatus::Qa, IssuePriority::High, "Beta"),
+            issue_row(3, IssueStatus::Qa, IssuePriority::High, "Gamma"),
+        ];
+
+        assert_eq!(
+            page.filter.statuses,
+            vec![IssueStatus::Open, IssueStatus::Qa]
+        );
+        assert_eq!(page.filter.priorities, vec![IssuePriority::High]);
+        let out = paginate(rows, page.limit, page.cursor);
+        assert_eq!(out.items.len(), 1);
+        assert_eq!(out.items[0].r#ref, "#2");
+        assert_eq!(out.next_cursor, Some("2".to_owned()));
+    }
+
+    fn issue_row(
+        number: u64,
+        status: IssueStatus,
+        priority: IssuePriority,
+        title: &str,
+    ) -> IssueIndexEntry {
+        IssueIndexEntry {
+            issue_ref: IssueRef::from(IssueNumber::new(number).unwrap()),
+            path: number.to_string(),
+            title: title.to_owned(),
+            status,
+            priority,
+            sprint: None,
+            assigned_agent_ids: Vec::new(),
+            updated_at: number,
+        }
+    }
+}