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>

frontend/src/adapters/mock/index.ts

@@ -136,6 +136,7 @@ import type {
   OpenTerminalOptions,
   ProfileGateway,
   ProjectGateway,
+  ProjectSettings,
   PermissionGateway,
   PluginConfigDocumentReadInput,
   PluginConfigDocumentUpdateInput,
@@ -178,6 +179,8 @@ import type {
   CreateTicketInput,
   UpdateTicketInput,
   UiPreferencesGateway,
+  UserSettings,
+  UserSettingsGateway,
   ViewWindowClosed,
   ViewWindowSnapshot,
   WindowGateway,
@@ -414,7 +417,6 @@ export class MockAgentGateway implements AgentGateway {
   /** Runtime kind per live agent (`agentId → kind`). */
   private liveKindByAgent = new Map<string, "pty" | "structured">();
   /** Last stopped runtime per agent for idempotent stop. */
-  private stoppedByAgent = new Map<string, StoppedLiveAgent>();
   /** Retained structured reply chunks per live chat session. */
   private chatScrollback = new Map<string, ReplyChunk[]>();
   /** Persisted custom chat drafts keyed by project/layout/node. */
@@ -539,14 +541,9 @@ export class MockAgentGateway implements AgentGateway {
     }
     const sessionId = this.liveSessionByAgent.get(agentId);
     if (!sessionId) {
-      const stopped = this.stoppedByAgent.get(agentId);
-      if (stopped) return stopped;
-      const err: GatewayError = {
-        code: "NOT_FOUND",
-        message: `agent ${agentId} has no live session`,
-      };
-      throw err;
+      return { agentId, stopped: [], alreadyStopped: true };
     }
+    const nodeId = this.liveByAgent.get(agentId) ?? "mock-node";
     const session = this.sessions.get(sessionId);
     if (session) session.closed = true;
     this.sessions.delete(sessionId);
@@ -557,11 +554,14 @@ export class MockAgentGateway implements AgentGateway {
     this.liveKindByAgent.delete(agentId);
     const stopped: StoppedLiveAgent = {
       agentId,
-      sessionId,
-      kind,
-      runtimeState: "stopped",
+      stopped: [{
+        sessionId,
+        nodeId,
+        kind,
+        runtimeState: "stopped",
+      }],
+      alreadyStopped: false,
     };
-    this.stoppedByAgent.set(agentId, stopped);
     return stopped;
   }
 
@@ -842,7 +842,6 @@ export class MockAgentGateway implements AgentGateway {
       this.liveByAgent.set(agentId, options.nodeId);
       this.liveSessionByAgent.set(agentId, sessionId);
       this.liveKindByAgent.set(agentId, "pty");
-      this.stoppedByAgent.delete(agentId);
     }
     const clearLive = () => {
       if (this.liveByAgent.get(agentId) === options.nodeId) {
@@ -910,7 +909,6 @@ export class MockAgentGateway implements AgentGateway {
       this.liveByAgent.set(agentId, options.nodeId);
       this.liveSessionByAgent.set(agentId, sessionId);
       this.liveKindByAgent.set(agentId, "structured");
-      this.stoppedByAgent.delete(agentId);
     }
     return {
       sessionId,
@@ -1251,6 +1249,7 @@ export class MockTerminalGateway implements TerminalGateway {
 export class MockProjectGateway implements ProjectGateway {
   private projects: Project[] = [];
   private contexts = new Map<string, string>();
+  private settings = new Map<string, ProjectSettings>();
   private restoreProjectIds: string[] = [];
   private restoreFailures = new Map<string, OpenProjectRestoreFailure>();
 
@@ -1426,6 +1425,28 @@ export class MockProjectGateway implements ProjectGateway {
     this.contexts.set(projectId, content);
   }
 
+  async readProjectSettings(projectId: string): Promise<ProjectSettings> {
+    if (!this.projects.some((project) => project.id === projectId)) {
+      throw { code: "NOT_FOUND", message: `project ${projectId} not found` };
+    }
+    return this.settings.get(projectId) ?? { themeColor: null };
+  }
+
+  async updateProjectSettings(
+    projectId: string,
+    settings: ProjectSettings,
+  ): Promise<ProjectSettings> {
+    if (!this.projects.some((project) => project.id === projectId)) {
+      throw { code: "NOT_FOUND", message: `project ${projectId} not found` };
+    }
+    if (settings.themeColor !== null && !/^#[0-9A-Fa-f]{6}$/.test(settings.themeColor)) {
+      throw { code: "INVALID", message: "themeColor must use #RRGGBB" };
+    }
+    const stored = { themeColor: settings.themeColor?.toUpperCase() ?? null };
+    this.settings.set(projectId, stored);
+    return stored;
+  }
+
   async listProjectFiles(_projectId: string, path: string): Promise<ProjectFileListing> {
     return { path, entries: [] };
   }
@@ -4838,6 +4859,7 @@ export function createMockGateways(): Gateways {
     window: new MockWindowGateway(),
     focusedProject: new MockFocusedProjectGateway(),
     uiPreferences: new MockUiPreferencesGateway(),
+    userSettings: new MockUserSettingsGateway(),
     plugin: new MockPluginGateway(),
     pluginWorkspace: new MockPluginWorkspaceGateway(),
     pluginTask: new MockPluginTaskGateway(),
@@ -4848,5 +4870,18 @@ export function createMockGateways(): Gateways {
   };
 }
 
+export class MockUserSettingsGateway implements UserSettingsGateway {
+  private settings: UserSettings = { defaultAgentTerminalInterface: null };
+
+  async readUserSettings(): Promise<UserSettings> {
+    return { ...this.settings };
+  }
+
+  async updateUserSettings(settings: UserSettings): Promise<UserSettings> {
+    this.settings = { ...settings };
+    return { ...this.settings };
+  }
+}
+
 // Re-export GatewayError so tests can reference the thrown shape.
 export type { GatewayError };