feat(inspection): add element inspection tools

[haddadrm]

Summary

• Add 17 new element inspection tools for DOM and CSS analysis
• Add new INSPECTION tool category
• Add --no-category-inspection CLI flag

New Tools

Tool	Description
inspect_element	Get element info, HTML, attributes, box model
get_element_styles	Get computed, matched, inherited CSS styles
get_element_box_model	Get layout dimensions
query_selector	Find elements by CSS selector
highlight_element / hide_highlight	Visual element highlighting
get_dom_tree	Get DOM tree structure
capture_dom_snapshot	Full-page DOM + styles capture
force_element_state	Force :hover/:focus/:active states
get_element_event_listeners	Get attached event listeners
get_element_at_position	Get element at x,y coordinates
search_dom	Search by text/selector/XPath
get_fonts_info	Get font usage info
show_layout_overlay	Show Grid/Flexbox overlays
get_accessibility_info	Get a11y tree info
compare_elements	Compare styles between elements
get_css_variables	Get CSS custom properties

Test Plan

• Build passes (npm run build)
• Tested locally with Claude Code MCP integration

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[OrKoN]

Consider upvoting a related feature request #86 Thanks for the PR but wee won't accept it since we do not want to re-implement the wrappers over CDP in the MCP server. We plan to use SDK classes exposed via chrome-devtools-frontend package instead. In any case, thanks for raising the PR and it gives a strong signal that there is interest in these sort of tools. cc @natorion