fix: livrable tickets #70 #100 #102 — UX surface scoping

- #70: implémentation suppression modèles locaux téléchargés
- #100: correction scroll OpenCode
- #102: correction fit TUI après switch/layout
- memory note scoping UX

frontend/src/adapters/http/requestResponseGateways.ts

@@ -229,6 +229,9 @@ export class HttpModelServerGateway implements ModelServerGateway {
   async deleteModelServer(serverId: string): Promise<void> {
     await this.http.invoke("delete_model_server", { serverId });
   }
+  async deleteModelArtifact(serverId: string): Promise<void> {
+    await this.http.invoke("delete_model_artifact", { serverId });
+  }
   previewModelServerCommand(config: LocalModelServerConfig): Promise<ModelServerCommandPreview> {
     return this.http.invoke<ModelServerCommandPreview>("preview_model_server_command", { config });
   }

frontend/src/adapters/mock/index.ts

@@ -1525,6 +1525,36 @@ export class MockModelServerGateway implements ModelServerGateway {
     this.servers = this.servers.filter((s) => s.id !== serverId);
   }
 
+  async deleteModelArtifact(serverId: string): Promise<void> {
+    const i = this.servers.findIndex((s) => s.id === serverId);
+    if (i < 0) {
+      const err: GatewayError = {
+        code: "not_configured",
+        message: "model server is not configured",
+      };
+      throw err;
+    }
+    const server = this.servers[i];
+    if (server.modelSource?.type !== "huggingFace") {
+      const err: GatewayError = {
+        code: "invalid",
+        message: "only managed Hugging Face model artifacts can be deleted",
+      };
+      throw err;
+    }
+    if (server.artifact?.state === "downloading" || this.inUse.has(serverId)) {
+      const err: GatewayError = {
+        code: "model_server_in_use",
+        message: "model artifact cannot be deleted while in use",
+      };
+      throw err;
+    }
+    this.servers[i] = {
+      ...server,
+      artifact: { state: "missing" },
+    };
+  }
+
   async previewModelServerCommand(
     config: LocalModelServerConfig,
   ): Promise<ModelServerCommandPreview> {

frontend/src/adapters/modelServer.ts

@@ -32,6 +32,10 @@ export class TauriModelServerGateway implements ModelServerGateway {
     await invoke("delete_model_server", { serverId });
   }
 
+  async deleteModelArtifact(serverId: string): Promise<void> {
+    await invoke("delete_model_artifact", { serverId });
+  }
+
   previewModelServerCommand(
     config: LocalModelServerConfig,
   ): Promise<ModelServerCommandPreview> {