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/ports/index.ts

@@ -744,7 +744,7 @@ export interface SaveOpenCodeProviderProfileInput {
  * `llama.cpp` servers an OpenCode profile can bind to via
  * `OpenCodeConfig.localModelServerId`. Mirrors the backend commands
  * (`list_model_servers`, `save_model_server`, `delete_model_server`,
- * `preview_model_server_command`).
+ * `preview_model_server_command`, `delete_model_artifact`).
  */
 export interface ModelServerGateway {
   /** Lists the declared local model servers. */
@@ -759,6 +759,13 @@ export interface ModelServerGateway {
    * `model_server_in_use` when a profile still references it.
    */
   deleteModelServer(serverId: string): Promise<void>;
+  /**
+   * Deletes the IdeA-managed downloaded model artifact for a server while
+   * keeping the server config. Rejects with `invalid` for local `.gguf` paths,
+   * `model_server_in_use` while downloading or used by a live agent, and
+   * `not_configured` when the server no longer exists.
+   */
+  deleteModelArtifact(serverId: string): Promise<void>;
   /**
    * Builds the `llama-server` command line the backend would launch for the
    * draft config, without persisting it. The backend is the sole authority on