docs: add GDrive sheet → infographic → Slides pipeline example

[amanbagrecha]

Summary

• New examples page: GDrive → infographic → Slides under docs/examples/. Walks readers through the three-part Canvas pipeline that reads a CSV/XLSX from Google Drive, generates an editorial infographic via Gemini 2.5 Flash Image (OpenRouter), uploads the PNG to Drive, and inserts it as a new slide into a Google Slides deck via presentations.batchUpdate.
• Sidebar position 18 so it lands right after the existing Google Calendar example in the agentic-workflow cluster.
• Adds one screenshot at static/img/examples/gdrive-to-slides-infographic.png — the actual infographic generated from airtravel.csv via the live canvas.

Highlights the Fused Google Drive integration, OpenRouter image generation, and the Slides API end-to-end without any S3 / fd:// intermediate storage.

Live canvas referenced in the page: https://unstable.fused.io/canvas/fc_2sa9BO3LSvy9JE9LOLNIax

Test plan

• Run npm start and confirm the page renders at /examples/gdrive-to-slides-infographic
• Confirm sidebar position (18) shows the new entry between "Will you be late to meetings?" (16) and "Thumbnail generator" (17) — adjust if a different ordering is preferred
• Verify the hero image loads (/img/examples/gdrive-to-slides-infographic.png)
• Click through the "Try the Canvas" share link to confirm it resolves
• Review the OpenRouter / Slides API enablement language under "Build it yourself" — update if/when Slides API moves from unstable to prod

🤖 Generated with Claude Code