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/domain/src/conversation_log.rs

@@ -91,8 +91,10 @@ pub struct ConversationTurn {
     pub id: TurnId,
     /// La conversation (paire) à laquelle ce tour appartient.
     pub conversation: ConversationId,
-    /// Horodatage (epoch millisecondes) du tour.
-    pub at_ms: u64,
+    /// Horodatage (epoch millisecondes) du tour. Absent uniquement pour les
+    /// lignes legacy écrites avant que l'horodatage ne devienne universel.
+    #[serde(default)]
+    pub at_ms: Option<u64>,
     /// L'origine de l'entrée (Humain ou Agent délégant).
     pub source: InputSource,
     /// La nature du tour (invite, réponse, activité outillée).
@@ -115,7 +117,7 @@ impl ConversationTurn {
         Self {
             id,
             conversation,
-            at_ms,
+            at_ms: Some(at_ms),
             source,
             role,
             text: text.into(),

crates/domain/src/lib.rs

@@ -67,6 +67,7 @@ pub mod readiness;
 pub mod remote;
 pub mod sandbox;
 pub mod session_limit;
+pub mod settings;
 pub mod skill;
 pub mod slash_command;
 pub mod sprint;
@@ -258,6 +259,8 @@ pub use sandbox::{
     SandboxKind, SandboxPlan, SandboxStatus,
 };
 
+pub use settings::{DefaultAgentTerminalInterface, IdeaUserSettings, ProjectSettings, ThemeColor};
+
 pub use orchestrator::{
     OrchestratorCommand, OrchestratorError, OrchestratorRequest, OrchestratorVisibility,
 };
@@ -277,9 +280,10 @@ pub use ports::{
     PluginManifestError, PluginManifestValidator, PluginMcpError, PluginMcpSupervisor,
     PluginPackageStore, PluginRegistryError, PluginRegistryStore, PluginStorageError,
     PluginStorageStore, PluginStoreError, PreparedContext, ProcessError, ProcessSpawner,
-    ProfileStore, ProjectPluginSettingsStore, ProjectStore, ProviderModelCatalogue, PtyError,
-    PtyHandle, PtyPort, RemoteError, RemoteHost, RemotePath, RuntimeError, RuntimePermissionProbe,
-    ScheduledTask, Scheduler, SpawnSpec, SprintStore, SprintStoreError, StoreError,
-    StructuredSessionEnvironment, StructuredSessionEnvironmentPreparer, SystemPermissionStore,
-    TemplateStore, WindowStateStore,
+    ProfileStore, ProjectPluginSettingsStore, ProjectSettingsStore, ProjectStore,
+    ProviderModelCatalogue, PtyError, PtyHandle, PtyPort, RemoteError, RemoteHost, RemotePath,
+    RuntimeError, RuntimePermissionProbe, ScheduledTask, Scheduler, SpawnSpec, SprintStore,
+    SprintStoreError, StoreError, StructuredSessionEnvironment,
+    StructuredSessionEnvironmentPreparer, SystemPermissionStore, TemplateStore, UserSettingsStore,
+    WindowStateStore,
 };

crates/domain/src/ports.rs

@@ -539,6 +539,31 @@ pub trait ProjectPluginSettingsStore: Send + Sync {
     ) -> Result<(), StoreError>;
 }
 
+/// Persistence for global, machine-local user settings.
+#[async_trait]
+pub trait UserSettingsStore: Send + Sync {
+    /// Loads settings, returning an empty document when missing.
+    async fn load(&self) -> Result<crate::IdeaUserSettings, StoreError>;
+    /// Persists the complete document.
+    async fn save(&self, settings: &crate::IdeaUserSettings) -> Result<(), StoreError>;
+}
+
+/// Persistence for settings owned by one project.
+#[async_trait]
+pub trait ProjectSettingsStore: Send + Sync {
+    /// Loads settings, returning an empty document when missing.
+    async fn load(
+        &self,
+        project_root: &crate::ProjectPath,
+    ) -> Result<crate::ProjectSettings, StoreError>;
+    /// Persists the complete document.
+    async fn save(
+        &self,
+        project_root: &crate::ProjectPath,
+        settings: &crate::ProjectSettings,
+    ) -> Result<(), StoreError>;
+}
+
 /// Manifest parser and validator.
 pub trait PluginManifestValidator: Send + Sync {
     /// Validates raw manifest bytes.

crates/domain/src/settings.rs

@@ -0,0 +1,69 @@
+//! Machine-local user preferences and project-owned presentation settings.
+
+use serde::{Deserialize, Serialize};
+
+/// Preferred interface when a new human-facing agent terminal is opened.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum DefaultAgentTerminalInterface {
+    /// Provider's native interactive terminal UI.
+    NativeTui,
+    /// IdeA's structured/custom CLI chat surface.
+    IdeaCli,
+}
+
+/// Global, machine-local IdeA preferences.
+#[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct IdeaUserSettings {
+    /// Default for newly launched human-facing agent terminals.
+    #[serde(default)]
+    pub default_agent_terminal_interface: Option<DefaultAgentTerminalInterface>,
+}
+
+/// Strict project theme colour (`#RRGGBB`).
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(try_from = "String", into = "String")]
+pub struct ThemeColor(String);
+
+impl ThemeColor {
+    /// Validates and builds a project theme colour.
+    pub fn new(value: impl Into<String>) -> Result<Self, String> {
+        let value = value.into();
+        let valid = value.len() == 7
+            && value.starts_with('#')
+            && value.as_bytes()[1..].iter().all(u8::is_ascii_hexdigit);
+        valid
+            .then_some(Self(value))
+            .ok_or_else(|| "themeColor must match #RRGGBB".to_owned())
+    }
+
+    /// Returns the validated wire representation.
+    #[must_use]
+    pub fn as_str(&self) -> &str {
+        &self.0
+    }
+}
+
+impl TryFrom<String> for ThemeColor {
+    type Error = String;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        Self::new(value)
+    }
+}
+
+impl From<ThemeColor> for String {
+    fn from(value: ThemeColor) -> Self {
+        value.0
+    }
+}
+
+/// Settings owned by one project and stored below its `.ideai` directory.
+#[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ProjectSettings {
+    /// Optional visual theme colour; absence keeps the product fallback.
+    #[serde(default)]
+    pub theme_color: Option<ThemeColor>,
+}