fix: show correct status for execute_command UI (Running vs Executed)

EXT-672: The execute_command UI now accurately shows the terminal state:
- Shows "Running" when a command is actively executing
- Shows "Executed" when the command has completed

Added "executed" translation key to all 18 locale files.

Author: roomote

webview-ui/src/components/chat/ChatRow.tsx

@@ -282,7 +282,7 @@ export const ChatRowContent = ({
 						<TerminalSquare className="size-4" aria-label="Terminal icon" />
 					),
 					<span style={{ color: normalColor, fontWeight: "bold" }}>
-						{t("chat:commandExecution.running")}
+						{isCommandExecuting ? t("chat:commandExecution.running") : t("chat:commandExecution.executed")}
 					</span>,
 				]
 			case "use_mcp_server":

webview-ui/src/i18n/locales/ca/chat.json

@@ -250,6 +250,7 @@
 	"commandExecution": {
 		"abort": "Abort",
 		"running": "Running",
+		"executed": "Executed",
 		"pid": "PID: {{pid}}",
 		"exitStatus": "Exited with status {{exitCode}}",
 		"manageCommands": "Auto-approved commands",