feat(domain,application,infrastructure,backend,web-server,app-tauri,frontend): bibliothèque d'icônes projet personnalisées importées par l'utilisateur — #358 (QA verte)

domain: variante ProjectIconSet::Custom, métadonnées CustomProjectIconAsset (id opaque, media type png/jpeg/webp, byte_size, dimensions décodées, sha256, nom de fichier original sans chemin, created_at), CustomProjectIconContent et port CustomProjectIconAssetStore (list/read/exists/create/delete) avec CustomProjectIconStoreError dédiée.
application: use case project_icon_assets — import validé png/jpeg/webp avec rejet du contenu SVG, dimensionnement et digest sha256, bibliothèque partagée à l'instance indépendante de tout projet, suppression refusée tant que l'asset est référencé par un projet.
infrastructure: store fichier store/project_icon_asset.rs — index canonique + octets, création atomique sous extension validée.
backend/web-server: contrat HTTP /api/project-icon-assets (GET liste, POST import, GET lecture, GET /usage, DELETE) avec prévol OPTIONS et tests contrat incluant le rejet SVG.
app-tauri: commandes import/list/read/get_usage/delete_custom_project_icon_asset exposées au frontend.
frontend: port ProjectIconAssetGateway (list/import/delete/getUrl sans exposer de chemin filesystem), gateways http+mock avec tests, DI, section Icônes personnalisées du ProjectIconPicker (import fichier accept png/jpeg/webp, sélection role=option, suppression avec retrait de sélection, erreurs lisibles i18n FR/EN), tests projectIcons étendus.

QA verte: contrats HTTP et Tauri identiques, suites cargo et npm ciblées vertes.

crates/app-tauri/src/commands.rs

@@ -54,21 +54,22 @@ use crate::dto::{
     CloneProfileFromSeedRequestDto, ConfigureProfilesRequestDto, ConversationDetailsDto,
     CreateAgentFromTemplateRequestDto, CreateAgentRequestDto, CreateLayoutRequestDto,
     CreateLayoutResultDto, CreateMemoryRequestDto, CreateProjectRequestDto, CreateSkillRequestDto,
-    CreateTemplateRequestDto, DeleteLayoutRequestDto, DeleteLayoutResultDto,
+    CreateTemplateRequestDto, CustomProjectIconAssetContentDto, CustomProjectIconAssetDto,
+    CustomProjectIconUsageDto, DeleteLayoutRequestDto, DeleteLayoutResultDto,
     DeliveredDelegationRequestDto, DetectProfilesRequestDto, DetectProfilesResponseDto,
     EmbedderEnginesDto, EmbedderProfileDto, EmbedderProfileListDto, ErrorDto,
     ExecuteSlashCommandRequestDto, ExecuteSlashCommandResponseDto, FirstRunStateDto,
     FrontAttachedRequestDto, GitBranchesDto, GitCheckoutRequestDto, GitCommitDto, GitCommitListDto,
     GitCommitRequestDto, GitStageRequestDto, GitStatusListDto, GraphCommitListDto,
     HealthRequestDto, HealthResponseDto, ImportChatAttachmentsRequestDto,
-    ImportChatAttachmentsResponseDto, InspectConversationRequestDto, InterruptAgentRequestDto,
-    LaunchAgentRequestDto, LayoutDto, LayoutOperationDto, ListLayoutsDto, LiveAgentListDto,
-    ManagedTempGcResponseDto, ManagedTempHandleRequestDto, ManagedTempLeaseDto,
-    ManagedTempLeaseResponseDto, MemoryDto, MemoryIndexDto, MemoryLinksDto, MemoryListDto,
-    ModelServerConfigDto, ModelServerConfigListDto, OpenCodeProviderListDto,
-    OpenProjectRestoreStateDto, OpenTerminalRequestDto, PreviewModelServerCommandDto, ProfileDto,
-    ProfileListDto, ProfileModelCatalogDto, ProjectDto, ProjectListDto,
-    ProjectMcpToolPermissionsDto, ProjectPermissionsDto, ProjectSettingsDto,
+    ImportChatAttachmentsResponseDto, ImportCustomProjectIconAssetRequestDto,
+    InspectConversationRequestDto, InterruptAgentRequestDto, LaunchAgentRequestDto, LayoutDto,
+    LayoutOperationDto, ListLayoutsDto, LiveAgentListDto, ManagedTempGcResponseDto,
+    ManagedTempHandleRequestDto, ManagedTempLeaseDto, ManagedTempLeaseResponseDto, MemoryDto,
+    MemoryIndexDto, MemoryLinksDto, MemoryListDto, ModelServerConfigDto, ModelServerConfigListDto,
+    OpenCodeProviderListDto, OpenProjectRestoreStateDto, OpenTerminalRequestDto,
+    PreviewModelServerCommandDto, ProfileDto, ProfileListDto, ProfileModelCatalogDto, ProjectDto,
+    ProjectListDto, ProjectMcpToolPermissionsDto, ProjectPermissionsDto, ProjectSettingsDto,
     ProjectSystemPermissionsDto, ProjectWorkStateDto, ReadAgentContextResponseDto,
     ReadChatDraftResponseDto, ReadConversationPageRequestDto, ReattachChatDto, ReattachResultDto,
     RecallMemoryRequestDto, RemoveOpenProjectRestoreEntryRequestDto, RemoveProjectRequestDto,
@@ -893,6 +894,81 @@ pub async fn update_project_settings(
         .map_err(Into::into)
 }
 
+/// Imports a PNG, JPEG or WebP into the instance-local shared icon library.
+#[tauri::command]
+pub async fn import_custom_project_icon_asset(
+    request: ImportCustomProjectIconAssetRequestDto,
+    state: State<'_, AppState>,
+) -> Result<CustomProjectIconAssetDto, ErrorDto> {
+    let bytes = STANDARD
+        .decode(request.data_base64.trim())
+        .map_err(|error| ErrorDto::invalid(format!("invalid base64 image bytes: {error}")))?;
+    state
+        .import_custom_project_icon_asset
+        .execute(request.original_filename, request.media_type, bytes)
+        .await
+        .map(Into::into)
+        .map_err(Into::into)
+}
+
+/// Lists the shared custom icon library.
+#[tauri::command]
+pub async fn list_custom_project_icon_assets(
+    state: State<'_, AppState>,
+) -> Result<Vec<CustomProjectIconAssetDto>, ErrorDto> {
+    state
+        .list_custom_project_icon_assets
+        .execute()
+        .await
+        .map(|assets| assets.into_iter().map(Into::into).collect())
+        .map_err(Into::into)
+}
+
+/// Reads one shared icon without exposing its filesystem path.
+#[tauri::command]
+pub async fn read_custom_project_icon_asset(
+    asset_id: String,
+    state: State<'_, AppState>,
+) -> Result<CustomProjectIconAssetContentDto, ErrorDto> {
+    state
+        .read_custom_project_icon_asset
+        .execute(&asset_id)
+        .await
+        .map(|output| CustomProjectIconAssetContentDto {
+            metadata: output.metadata.into(),
+            data_base64: STANDARD.encode(output.bytes),
+        })
+        .map_err(Into::into)
+}
+
+/// Returns current registered-project usage for one shared icon.
+#[tauri::command]
+pub async fn get_custom_project_icon_asset_usage(
+    asset_id: String,
+    state: State<'_, AppState>,
+) -> Result<CustomProjectIconUsageDto, ErrorDto> {
+    state
+        .get_custom_project_icon_asset_usage
+        .execute(&asset_id)
+        .await
+        .map(Into::into)
+        .map_err(Into::into)
+}
+
+/// Deletes one shared icon when it is unused.
+#[tauri::command]
+pub async fn delete_custom_project_icon_asset(
+    asset_id: String,
+    state: State<'_, AppState>,
+) -> Result<CustomProjectIconUsageDto, ErrorDto> {
+    state
+        .delete_custom_project_icon_asset
+        .execute(&asset_id)
+        .await
+        .map(Into::into)
+        .map_err(Into::into)
+}
+
 /// `get_project_permissions` — read `.ideai/permissions.json`.
 ///
 /// # Errors