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/src/store/mod.rs

@@ -17,6 +17,7 @@ mod profile;
 mod project;
 mod project_plugin;
 mod secrets;
+mod settings;
 mod skill;
 mod system_permission;
 mod template;
@@ -44,6 +45,7 @@ pub use profile::{FsEmbedderProfileStore, FsProfileStore};
 pub use project::FsProjectStore;
 pub use project_plugin::FsProjectPluginSettingsStore;
 pub use secrets::FsSecretStore;
+pub use settings::{FsProjectSettingsStore, FsUserSettingsStore};
 pub use skill::FsSkillStore;
 pub use system_permission::FsSystemPermissionStore;
 pub use template::FsTemplateStore;

crates/infrastructure/src/store/settings.rs

@@ -0,0 +1,104 @@
+//! JSON persistence for global user settings and project-owned settings.
+
+use async_trait::async_trait;
+use domain::{
+    FileSystem, FsError, IdeaUserSettings, ProjectPath, ProjectSettings, ProjectSettingsStore,
+    RemotePath, StoreError, UserSettingsStore,
+};
+use std::sync::Arc;
+
+#[derive(Clone)]
+/// File-backed global user-settings adapter.
+pub struct FsUserSettingsStore {
+    fs: Arc<dyn FileSystem>,
+    app_data_dir: String,
+}
+impl FsUserSettingsStore {
+    /// Builds an adapter rooted in the machine-local application data directory.
+    #[must_use]
+    pub fn new(fs: Arc<dyn FileSystem>, app_data_dir: impl Into<String>) -> Self {
+        Self {
+            fs,
+            app_data_dir: app_data_dir.into(),
+        }
+    }
+    fn path(&self) -> RemotePath {
+        RemotePath::new(format!(
+            "{}/settings.json",
+            self.app_data_dir.trim_end_matches(['/', '\\'])
+        ))
+    }
+}
+#[async_trait]
+impl UserSettingsStore for FsUserSettingsStore {
+    async fn load(&self) -> Result<IdeaUserSettings, StoreError> {
+        match self.fs.read(&self.path()).await {
+            Ok(bytes) => {
+                serde_json::from_slice(&bytes).map_err(|e| StoreError::Serialization(e.to_string()))
+            }
+            Err(FsError::NotFound(_)) => Ok(IdeaUserSettings::default()),
+            Err(error) => Err(StoreError::Io(error.to_string())),
+        }
+    }
+    async fn save(&self, settings: &IdeaUserSettings) -> Result<(), StoreError> {
+        self.fs
+            .create_dir_all(&RemotePath::new(self.app_data_dir.clone()))
+            .await
+            .map_err(|e| StoreError::Io(e.to_string()))?;
+        let mut bytes = serde_json::to_vec_pretty(settings)
+            .map_err(|e| StoreError::Serialization(e.to_string()))?;
+        bytes.push(b'\n');
+        self.fs
+            .write(&self.path(), &bytes)
+            .await
+            .map_err(|e| StoreError::Io(e.to_string()))
+    }
+}
+
+#[derive(Clone)]
+/// File-backed project-settings adapter.
+pub struct FsProjectSettingsStore {
+    fs: Arc<dyn FileSystem>,
+}
+impl FsProjectSettingsStore {
+    /// Builds an adapter over the location-neutral filesystem port.
+    #[must_use]
+    pub fn new(fs: Arc<dyn FileSystem>) -> Self {
+        Self { fs }
+    }
+    fn path(root: &ProjectPath) -> RemotePath {
+        RemotePath::new(format!(
+            "{}/.ideai/project-settings.json",
+            root.as_str().trim_end_matches(['/', '\\'])
+        ))
+    }
+}
+#[async_trait]
+impl ProjectSettingsStore for FsProjectSettingsStore {
+    async fn load(&self, root: &ProjectPath) -> Result<ProjectSettings, StoreError> {
+        match self.fs.read(&Self::path(root)).await {
+            Ok(bytes) => {
+                serde_json::from_slice(&bytes).map_err(|e| StoreError::Serialization(e.to_string()))
+            }
+            Err(FsError::NotFound(_)) => Ok(ProjectSettings::default()),
+            Err(error) => Err(StoreError::Io(error.to_string())),
+        }
+    }
+    async fn save(&self, root: &ProjectPath, settings: &ProjectSettings) -> Result<(), StoreError> {
+        let dir = RemotePath::new(format!(
+            "{}/.ideai",
+            root.as_str().trim_end_matches(['/', '\\'])
+        ));
+        self.fs
+            .create_dir_all(&dir)
+            .await
+            .map_err(|e| StoreError::Io(e.to_string()))?;
+        let mut bytes = serde_json::to_vec_pretty(settings)
+            .map_err(|e| StoreError::Serialization(e.to_string()))?;
+        bytes.push(b'\n');
+        self.fs
+            .write(&Self::path(root), &bytes)
+            .await
+            .map_err(|e| StoreError::Io(e.to_string()))
+    }
+}