docs: add troubleshooting tips and selector syntax guide

[giordano-lucas]

• Add Tips & Troubleshooting section to SKILL.md covering observe workarounds, Playwright selectors, nth syntax, and modal handling
• Document ViewerUrl for watching headless sessions live
• Add bot detection / stealth troubleshooting guide
• Add Tips subsection to README.md for quick reference
• Enhance form-automation.sh template with selector examples

Based on user feedback about observe inconsistency and selector confusion.

Greptile Overview

Greptile Summary

This PR expands the documentation around browser automation ergonomics: it adds a quick “Tips” section to the main README and a more detailed “Tips & Troubleshooting” section to the notte-browser skill guide. The new docs focus on practical workarounds for occasional observe inconsistencies, using Playwright selector syntax (including >> nth=), handling modals, and viewing headless sessions via the viewer URL / notte sessions viewer. The form automation template is also updated with selector examples in comments for easier copy/paste.

Confidence Score: 4/5

• This PR is safe to merge with minimal risk since it only updates documentation and templates.
• Changes are documentation-only; the main risk is user confusion from inconsistent selector/ID syntax examples rather than runtime breakage.
• README.md and skills/notte-browser/SKILL.md (ensure selector/ID syntax matches actual CLI behavior).

Important Files Changed

Filename	Overview
README.md	Adds a short Tips section about viewer URL, Playwright selectors, nth syntax, and closing modals; minor inconsistency with existing selector/id examples.
skills/notte-browser/SKILL.md	Adds a substantial Tips & Troubleshooting section (observe inconsistency, selector syntax, modals, viewer, bot detection); appears accurate but duplicates/varies ID/selector conventions in places.
skills/notte-browser/templates/form-automation.sh	Expands comments in the form automation template with selector examples; no functional code changes.

[greptile-apps]

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