NotebookLM adds infographic style, detail controls

This is a smart product update because it pushes NotebookLM up the stack from research assistant to lightweight presentation layer.

• –The new detail controls matter because source-heavy notebooks often need different compression levels for exec summaries versus deep-dive explainers
• –Style guidance gives users more control over output tone, which makes NotebookLM more credible for sharing research beyond the notebook itself
• –Google is steadily turning NotebookLM into a packaging tool for knowledge work, not just a place to query documents
• –For AI developers, that makes NotebookLM more interesting as a fast way to turn technical research, specs, or review notes into stakeholder-friendly artifacts