feat(domain,application,infrastructure,backend,web-server,app-tauri,frontend): lot utilisateur #325 #326 — icônes projet avec watermark CLI custom et localisation FR/EN (QA verte)

Lot en un seul commit: les deux features partagent les mêmes contrats
(domain/settings.rs, DTO, commandes Tauri/HTTP, web-server) et les mêmes
surfaces UI — la séparation par fichiers était impossible sans chirurgie
de hunks risquant des états intermédiaires non compilables (convention
lot des batches #310-#313 et #315).

#325 — icône configurable par projet, watermark CLI custom:
- domaine: ProjectIconSet (devicon, simple-icons, lucide, idea),
  ProjectIconRef validé (nom ASCII 1..=64, -_. internes), champ icon
  optionnel sur ProjectSettings; sérialisation camelCase et try_from
  strict
- application: UpdateProjectSettings.execute accepte un patch
  theme_color OU icon (absent = inchangé, null = défaut produit), tests
  in-dependants avec store mémoire
- backend/app-tauri/web-server: ProjectIconRefDto, UpdateProjectSettingsRequestDto
  avec icon optionnel (désérialisation additive), commandes
  update_project_settings alignées Tauri/HTTP, tests DTO et HTTP
  (défaut null, set, clear, nom invalide rejeté)
- frontend: catalogue projectIcons (recherche EN), ProjectIconPicker en
  grille multi-lignes dans Paramètres projet, affichage de l'icône dans
  ProjectTabs et watermark grand format à faible opacité en fond de CLI
  custom; ports ProjectSettings.icon, Partial<ProjectSettings>,
  adapters tauri/mock/http et tests alignés

#326 — localisation FR/EN et traduction des textes IdeA:
- domaine: IdeaLanguage (fr | en), champ language optionnel sur
  IdeaUserSettings (absence = défaut produit, série additive validée)
- backend/web-server: UserSettingsDto.language, update_user_settings
  accepte language, tests HTTP alignés; fixtures structured_launch_d3
  mises à jour
- frontend: i18n/ (catalogue FR/EN, I18nProvider, scan anti-régression
  des sources visibles), GeneralSettings avec sélecteur de langue dans
  les paramètres, setupI18n dans vitest; migration de l'ensemble des
  textes hardcodés vers le catalogue sur toutes les surfaces (agents,
  layout, projets, tickets, sprints, web, plugins, permissions, git,
  templates, skills, mémoire, model servers, embedder, first-run,
  devices, scheduled tasks, workstate, dialogs), FR conservé par défaut;
  recherche d'icônes #325 en anglais conformément au ticket

QA verte sur feature/batch-325-326-project-icons-localisation. Aucun push.

frontend/src/features/permissions/mcpToolGroups.ts

@@ -14,6 +14,8 @@ export interface McpToolGroupDef {
   label: string;
   tools: string[];
 }
+type Tr = (french: string, english: string) => string;
+const fr: Tr = (french) => french;
 
 /** Domain groups, in display order (carnet #82 — Conception UX/F). */
 export const MCP_TOOL_GROUPS: McpToolGroupDef[] = [
@@ -124,9 +126,22 @@ export const MCP_TOOL_LABELS: Record<string, string> = {
   idea_run_in_background: "Exécuter une commande en arrière-plan",
 };
 
+const MCP_TOOL_LABELS_EN: Record<string, string> = {
+  idea_project_list: "List IdeA projects", idea_project_read_context: "Read another project's context", idea_project_list_agents: "List agents in another project", idea_project_ask_agent: "Ask an agent in another project", idea_project_cancel_agent: "Cancel a cross-project request",
+  idea_list_agents: "List agents", idea_context_read: "Read an agent's context", idea_memory_read: "Read project memory", idea_skill_read: "Read a skill", idea_workstate_read: "Read work state", idea_ticket_read: "Read a ticket", idea_ticket_list: "List tickets", idea_ticket_read_carnet: "Read ticket notes", idea_sprint_list: "List sprints",
+  idea_ask_agent: "Delegate to an agent", idea_ask_agents: "Ask several agents", idea_launch_agent: "Launch an agent", idea_stop_agent: "Stop an agent", idea_update_context: "Update an agent's context", idea_context_propose: "Propose context", idea_memory_write: "Write project memory", idea_workstate_set: "Write work state", idea_create_skill: "Create a skill",
+  idea_ticket_create: "Create a ticket", idea_ticket_update: "Update a ticket", idea_ticket_update_status: "Update ticket status", idea_ticket_update_priority: "Update ticket priority", idea_ticket_update_carnet: "Update ticket notes", idea_ticket_link: "Link tickets", idea_ticket_unlink: "Unlink tickets", idea_run_in_background: "Run a command in the background",
+};
+
+export function mcpToolGroupLabel(group: McpToolGroupDef, tr: Tr = fr): string {
+  const english: Record<string, string> = { crossProject: "IdeA cross-project", readProject: "Project read", readTickets: "Ticket read", delegation: "Agent delegation", contextMemory: "Context and memory", tickets: "Tickets", work: "Work and execution", skills: "Skills", other: "Other" };
+  return tr(group.label, english[group.id] ?? group.label);
+}
+
 /** Short human label for `tool`, falling back to the exact name if unmapped. */
-export function mcpToolLabel(tool: string): string {
-  return MCP_TOOL_LABELS[tool] ?? tool;
+export function mcpToolLabel(tool: string, tr: Tr = fr): string {
+  const french = MCP_TOOL_LABELS[tool];
+  return french ? tr(french, MCP_TOOL_LABELS_EN[tool] ?? french) : tool;
 }
 
 /** The group a tool belongs to, or `undefined` if not locally mapped. */