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/domain/src/lib.rs

@@ -270,8 +270,9 @@ pub use scheduled_task::{
 };
 
 pub use settings::{
-    DefaultAgentTerminalInterface, IdeaLanguage, IdeaUserSettings, ProjectIconRef, ProjectIconSet,
-    ProjectSettings, ThemeColor, MAX_PROJECT_ICON_NAME_LEN,
+    CustomProjectIconAsset, CustomProjectIconContent, DefaultAgentTerminalInterface, IdeaLanguage,
+    IdeaUserSettings, ProjectIconRef, ProjectIconSet, ProjectSettings, ThemeColor,
+    MAX_PROJECT_ICON_NAME_LEN,
 };
 
 pub use orchestrator::{
@@ -283,19 +284,20 @@ pub use ports::{
     AssistantContextProvider, BackgroundCompletionStream, BackgroundTaskCompletion,
     BackgroundTaskHandle, BackgroundTaskPortError, BackgroundTaskRunner, BackgroundTaskSpec,
     BackgroundTaskStore, CliVersionReader, Clock, CompatibilityMatrixSource, ContextInjectionPlan,
-    DirEntry, Embedder, EmbedderEnvInspector, EmbedderEnvReport, EmbedderError,
-    EmbedderProfileStore, EmbedderPromptDismissal, EmbedderPromptStore, EventBus, EventStream,
-    ExitStatus, FileSystem, FsError, GitCommitInfo, GitError, GitFileStatus, GitPort, GraphCommit,
-    IdGenerator, IssueAttachmentContent, IssueNumberAllocator, IssueStore, IssueStoreError,
-    LiveStateStore, LocalPath, McpToolPermissionStore, MemoryError, MemoryQuery, MemoryRecall,
-    MemoryStore, ModelArtifactCancel, ModelArtifactDownloader, ModelArtifactProgress,
-    ModelArtifactResolution, Output, OutputStream, PermissionStore, PluginManifestBytes,
-    PluginManifestError, PluginManifestValidator, PluginMcpError, PluginMcpSupervisor,
-    PluginPackageStore, PluginRegistryError, PluginRegistryStore, PluginStorageError,
-    PluginStorageStore, PluginStoreError, PluginWorkspaceExecAuditSink, PreparedContext,
-    ProcessError, ProcessSpawner, ProfileStore, ProjectPluginSettingsStore, ProjectSettingsStore,
-    ProjectStore, ProviderModelCatalogue, PtyError, PtyHandle, PtyPort, RemoteError, RemoteHost,
-    RemotePath, RuntimeError, RuntimePermissionProbe, ScheduledProjectTaskStore, ScheduledTask,
+    CustomProjectIconAssetStore, CustomProjectIconStoreError, DirEntry, Embedder,
+    EmbedderEnvInspector, EmbedderEnvReport, EmbedderError, EmbedderProfileStore,
+    EmbedderPromptDismissal, EmbedderPromptStore, EventBus, EventStream, ExitStatus, FileSystem,
+    FsError, GitCommitInfo, GitError, GitFileStatus, GitPort, GraphCommit, IdGenerator,
+    IssueAttachmentContent, IssueNumberAllocator, IssueStore, IssueStoreError, LiveStateStore,
+    LocalPath, McpToolPermissionStore, MemoryError, MemoryQuery, MemoryRecall, MemoryStore,
+    ModelArtifactCancel, ModelArtifactDownloader, ModelArtifactProgress, ModelArtifactResolution,
+    Output, OutputStream, PermissionStore, PluginManifestBytes, PluginManifestError,
+    PluginManifestValidator, PluginMcpError, PluginMcpSupervisor, PluginPackageStore,
+    PluginRegistryError, PluginRegistryStore, PluginStorageError, PluginStorageStore,
+    PluginStoreError, PluginWorkspaceExecAuditSink, PreparedContext, ProcessError, ProcessSpawner,
+    ProfileStore, ProjectPluginSettingsStore, ProjectSettingsStore, ProjectStore,
+    ProviderModelCatalogue, PtyError, PtyHandle, PtyPort, RemoteError, RemoteHost, RemotePath,
+    RuntimeError, RuntimePermissionProbe, ScheduledProjectTaskStore, ScheduledTask,
     ScheduledTaskStoreError, Scheduler, SpawnSpec, SprintStore, SprintStoreError, StoreError,
     StructuredSessionEnvironment, StructuredSessionEnvironmentPreparer, SystemPermissionStore,
     TemplateStore, UserSettingsStore, WindowStateStore, WorkspaceToolExecError,

crates/domain/src/ports.rs

@@ -66,6 +66,7 @@ use crate::plugin::{
 use crate::profile::{AgentProfile, EmbedderProfile, StructuredAdapter};
 use crate::project::{Project, ProjectPath};
 use crate::remote::RemoteKind;
+use crate::settings::{CustomProjectIconAsset, CustomProjectIconContent};
 use crate::skill::{Skill, SkillScope};
 use crate::sprint::{Sprint, SprintIndexEntry, SprintVersion};
 use crate::system_permissions::{ProjectSystemPermissions, RuntimePermissionSnapshot};
@@ -564,6 +565,43 @@ pub trait ProjectSettingsStore: Send + Sync {
     ) -> Result<(), StoreError>;
 }
 
+/// Failures from the instance-local custom project icon library.
+#[derive(Debug, Clone, PartialEq, Eq, Error)]
+pub enum CustomProjectIconStoreError {
+    /// Asset id is absent from the canonical index.
+    #[error("custom project icon asset not found")]
+    NotFound,
+    /// Persisted data is malformed.
+    #[error("custom project icon asset store format error: {0}")]
+    Format(String),
+    /// Filesystem operation failed.
+    #[error("custom project icon asset store I/O error: {0}")]
+    Io(String),
+}
+
+/// Persistence for the workspace-wide user icon library.
+#[async_trait]
+pub trait CustomProjectIconAssetStore: Send + Sync {
+    /// Lists persisted metadata in stable creation order.
+    async fn list(&self) -> Result<Vec<CustomProjectIconAsset>, CustomProjectIconStoreError>;
+    /// Reads metadata and bytes for one id.
+    async fn read(
+        &self,
+        asset_id: &str,
+    ) -> Result<CustomProjectIconContent, CustomProjectIconStoreError>;
+    /// Returns whether an id exists in the canonical index.
+    async fn exists(&self, asset_id: &str) -> Result<bool, CustomProjectIconStoreError>;
+    /// Atomically adds metadata and bytes under the validated extension.
+    async fn create(
+        &self,
+        asset: &CustomProjectIconAsset,
+        extension: &str,
+        bytes: &[u8],
+    ) -> Result<(), CustomProjectIconStoreError>;
+    /// Deletes one unused asset.
+    async fn delete(&self, asset_id: &str) -> Result<(), CustomProjectIconStoreError>;
+}
+
 /// Manifest parser and validator.
 pub trait PluginManifestValidator: Send + Sync {
     /// Validates raw manifest bytes.

crates/domain/src/settings.rs

@@ -38,6 +38,8 @@ pub struct IdeaUserSettings {
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "kebab-case")]
 pub enum ProjectIconSet {
+    /// User-imported icon from the instance-local shared library.
+    Custom,
     /// Unicode emoji catalogue.
     Emoji,
     /// Devicon language and platform catalogue.
@@ -50,6 +52,37 @@ pub enum ProjectIconSet {
     Idea,
 }
 
+/// Metadata for one user-imported project icon.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct CustomProjectIconAsset {
+    /// Opaque stable ASCII id used by [`ProjectIconRef`].
+    pub id: String,
+    /// Validated image media type.
+    pub media_type: String,
+    /// Stored byte count.
+    pub byte_size: u64,
+    /// Decoded pixel width.
+    pub width: u32,
+    /// Decoded pixel height.
+    pub height: u32,
+    /// Lowercase SHA-256 digest of the stored bytes.
+    pub sha256: String,
+    /// Basename supplied by the user; never a local path.
+    pub original_filename: String,
+    /// Creation time as epoch milliseconds.
+    pub created_at: i64,
+}
+
+/// Stored custom icon together with its validated image bytes.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct CustomProjectIconContent {
+    /// Persisted metadata.
+    pub asset: CustomProjectIconAsset,
+    /// Exact raster bytes.
+    pub bytes: Vec<u8>,
+}
+
 /// Maximum byte length of a stable project icon name.
 pub const MAX_PROJECT_ICON_NAME_LEN: usize = 64;