feat(coding-agent): add message copy shortcut

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -2583,6 +2583,7 @@ export class InteractiveMode {
 		this.defaultEditor.onAction("app.tools.expand", () => this.toggleToolOutputExpansion());
 		this.defaultEditor.onAction("app.thinking.toggle", () => this.toggleThinkingBlockVisibility());
 		this.defaultEditor.onAction("app.editor.external", () => this.openExternalEditor());
+		this.defaultEditor.onAction("app.message.copy", () => void this.handleCopyCommand());
 		this.defaultEditor.onAction("app.message.followUp", () => this.handleFollowUp());
 		this.defaultEditor.onAction("app.message.dequeue", () => this.handleDequeue());
 		this.defaultEditor.onAction("app.session.new", () => this.handleClearCommand());
@@ -4708,6 +4709,18 @@ export class InteractiveMode {
 				initialSelectedId,
 				initialFilterMode,
 			);
+			selector.onCopy = async (text) => {
+				if (!text) {
+					this.showError("Selected entry has no text to copy");
+					return;
+				}
+				try {
+					await copyToClipboard(text);
+					this.showStatus("Copied selected message to clipboard");
+				} catch (error) {
+					this.showError(error instanceof Error ? error.message : String(error));
+				}
+			};
 			return { component: selector, focus: selector };
 		});
 	}
@@ -5735,6 +5748,7 @@ export class InteractiveMode {
 		const toggleThinking = this.getAppKeyDisplay("app.thinking.toggle");
 		const externalEditor = this.getAppKeyDisplay("app.editor.external");
 		const cycleModelBackward = this.getAppKeyDisplay("app.model.cycleBackward");
+		const copyMessage = this.getAppKeyDisplay("app.message.copy");
 		const followUp = this.getAppKeyDisplay("app.message.followUp");
 		const dequeue = this.getAppKeyDisplay("app.message.dequeue");
 		const pasteImage = this.getAppKeyDisplay("app.clipboard.pasteImage");
@@ -5778,6 +5792,7 @@ export class InteractiveMode {
 | \`${expandTools}\` | Toggle tool output expansion |
 | \`${toggleThinking}\` | Toggle thinking block visibility |
 | \`${externalEditor}\` | Edit message in external editor |
+| \`${copyMessage}\` | Copy last assistant message |
 | \`${followUp}\` | Queue follow-up message |
 | \`${dequeue}\` | Restore queued messages |
 | \`${pasteImage}\` | Paste image from clipboard |