feat: add 14 new browser automation tools

[angiejones]

Summary

Adds 14 new tools. All tools follow existing patterns, include full test coverage, and are backward-compatible.

New Tools

Element Utilities

• clear_element — Clear input/textarea content
• get_element_attribute — Get element attribute values (e.g., href, value, class)
• scroll_to_element — Scroll page to make element visible (closes Scroll to an element #22)
• execute_script — Execute arbitrary JavaScript in the browser

Window/Tab Management (closes #37)

• switch_to_window — Switch to a window/tab by handle
• get_window_handles — List all window/tab handles
• switch_to_latest_window — Switch to most recently opened window
• close_current_window — Close current window and switch back

Frame Management

• switch_to_frame — Switch focus to iframe by locator or index
• switch_to_default_content — Return focus to main page from iframe

Alert/Dialog Handling

• accept_alert — Accept browser alert/confirm/prompt dialogs
• dismiss_alert — Dismiss browser dialogs
• get_alert_text — Read alert dialog text
• send_alert_text — Type into prompt dialogs

Bug Fix

• Fixed resource list API for MCP client compatibility (closes MCP Resource List issue #33)

Testing

• 26 new tests covering all new tools
• 4 new test fixtures (alerts, frames, scroll, windows)
• Updated server test to verify all 28 tools
• All 72 tests pass ✅

Credits

Inspired by community contributions from @NachoBrito (#38), @dhivakaranthonydoss7-eng (#36), @VishalBose7 (#27), and @rpallavisharma (#28). Their PRs were closed in favor of this consolidated implementation with consistent patterns and full test coverage.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/new-tools

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