refactor: change open recipe in new window to pass recipe id

[zanesq]

Summary

Use recipeId instead of encoded deeplinks when opening a new window

For internal flows (open recipe in new window, save & run), we now pass just the recipe manifest id string through the IPC chain instead of encoding the full recipe into a deeplink. The server's existing recipe_id + load_recipe_by_id support handles the lookup.

Also refactored createChatWindow from 6 positional optional params to an options object while I was in there.

Before:

window.electron.createChatWindow(undefined, undefined, undefined, undefined, undefined, savedId);

After:

window.electron.createChatWindow({ recipeId });

Verified locally with recipes in new windows from the ui and from deeplinks.