feat(backend,frontend): lot utilisateur #310 #311 #312 #313 — horodatage conversation, stop agent robuste, préférence terminal par défaut, paramètres projet (QA verte)

- #310: horodatage de tous les messages et événements de conversation visibles — composant partagé EntryTimestamp, timestamps propagés dans le transcript chat, les annonces inter-agent et le viewer de conversation, normalisation côté domain/adapters (conversation_log, paginate).
- #311: stop d'agent robuste pour PTY non monté, sessions headless et CLI custom — lifecycle/orchestrator durcis, ponts chat app-tauri/web-server alignés, arrêt fiable sans session orpheline.
- #312: préférence globale d'interface terminal par défaut — nouveau store settings (domain/application/infrastructure + tests), DTO et commandes backend, adapter frontend userSettings, panneau TerminalSettings dans les paramètres globaux.
- #313: Paramètres du projet — contexte de projet éditable et couleur de thème par projet (ProjectSettingsPanel + projectTheme), teinte des onglets projet, persistance via DTO projet.

QA verte (GO QA sur feature/batch-310-311-312-313-chat-stop-prefs-theme) — vérifications Git: git diff --cached --check OK; staging borné à crates/ et frontend/ (74 fichiers, +2105/-531), commit unique de lot conforme à la convention des lots (précédents batch-151/158/159, batch-210/211/212) car les fichiers partagés (dto.rs, commands.rs, CustomAgentChatView) entrelacent les 4 tickets.

fichiers .ideai/* (agents/test.md, chat-drafts.json, system-permissions.json, tickets/counter.json, tickets/index.json, tickets/308-313/), attachments/ et scripts/ hors périmètre et préservés en worktree ; aucun push.

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

crates/infrastructure/tests/conversation_log.rs

@@ -133,6 +133,26 @@ async fn append_writes_one_valid_json_line_per_turn() {
     }
 }
 
+#[tokio::test]
+async fn legacy_line_without_timestamp_remains_readable_without_backfill() {
+    let tmp = TempDir::new();
+    let c = conv_id(91);
+    std::fs::create_dir_all(tmp.conversation_dir(c)).unwrap();
+    let raw = format!(
+        "{{\"id\":\"{}\",\"conversation\":\"{}\",\"source\":{{\"kind\":\"human\"}},\"role\":\"prompt\",\"text\":\"legacy\"}}\n",
+        turn_id(1), c
+    );
+    std::fs::write(tmp.log_path(c), &raw).unwrap();
+
+    let turns = FsConversationLog::new(&tmp.project_path())
+        .read(c, None)
+        .await
+        .unwrap();
+    assert_eq!(turns.len(), 1);
+    assert_eq!(turns[0].at_ms, None);
+    assert_eq!(std::fs::read_to_string(tmp.log_path(c)).unwrap(), raw);
+}
+
 // ---------------------------------------------------------------------------
 // survives a "restart" — a fresh instance on the same root relits everything
 // ---------------------------------------------------------------------------

crates/infrastructure/tests/settings.rs

@@ -0,0 +1,74 @@
+use std::path::PathBuf;
+use std::sync::Arc;
+
+use domain::{
+    DefaultAgentTerminalInterface, FileSystem, IdeaUserSettings, ProjectPath, ProjectSettings,
+    ProjectSettingsStore, ThemeColor, UserSettingsStore,
+};
+use infrastructure::{FsProjectSettingsStore, FsUserSettingsStore, LocalFileSystem};
+use uuid::Uuid;
+
+struct TempDir(PathBuf);
+impl TempDir {
+    fn new() -> Self {
+        let path = std::env::temp_dir().join(format!("idea-settings-{}", Uuid::new_v4()));
+        std::fs::create_dir_all(&path).unwrap();
+        Self(path)
+    }
+    fn root(&self) -> ProjectPath {
+        ProjectPath::new(self.0.to_string_lossy().into_owned()).unwrap()
+    }
+}
+impl Drop for TempDir {
+    fn drop(&mut self) {
+        let _ = std::fs::remove_dir_all(&self.0);
+    }
+}
+fn fs() -> Arc<dyn FileSystem> {
+    Arc::new(LocalFileSystem::new())
+}
+
+#[tokio::test]
+async fn global_user_preference_persists_outside_project() {
+    let tmp = TempDir::new();
+    let store = FsUserSettingsStore::new(fs(), tmp.0.to_string_lossy());
+    assert_eq!(store.load().await.unwrap(), IdeaUserSettings::default());
+    let settings = IdeaUserSettings {
+        default_agent_terminal_interface: Some(DefaultAgentTerminalInterface::IdeaCli),
+    };
+    store.save(&settings).await.unwrap();
+    assert_eq!(
+        FsUserSettingsStore::new(fs(), tmp.0.to_string_lossy())
+            .load()
+            .await
+            .unwrap(),
+        settings
+    );
+    assert!(tmp.0.join("settings.json").is_file());
+    assert!(!tmp.0.join(".ideai").exists());
+}
+
+#[tokio::test]
+async fn project_settings_missing_then_valid_round_trip() {
+    let tmp = TempDir::new();
+    let store = FsProjectSettingsStore::new(fs());
+    assert_eq!(
+        store.load(&tmp.root()).await.unwrap(),
+        ProjectSettings::default()
+    );
+    assert!(!tmp.0.join(".ideai/project-settings.json").exists());
+    let settings = ProjectSettings {
+        theme_color: Some(ThemeColor::new("#12AbEF").unwrap()),
+    };
+    store.save(&tmp.root(), &settings).await.unwrap();
+    assert_eq!(store.load(&tmp.root()).await.unwrap(), settings);
+    assert!(!tmp.0.join(".ideai/CONTEXT.md").exists());
+}
+
+#[test]
+fn theme_color_validation_is_strict() {
+    assert!(ThemeColor::new("#112233").is_ok());
+    for invalid in ["112233", "#123", "#GG0000", "#11223344", "# 12233"] {
+        assert!(ThemeColor::new(invalid).is_err(), "accepted {invalid}");
+    }
+}