ENG-1596. ENG-1597, ENG-1598: Display, multi-select, and copy extracted nodes

[sid597]

Doing all 3 issues in a single PR because the surface area that these 3 contain is mostly the same. The code is not hard to review and there is no scope creep in it.

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[linear-code]

ENG-1596 Display extracted node as reviewable blocks with supporting evidence

ENG-1597 Multi-select of extracted node blocks

ENG-1598 Copy selected extracted node(s) to clipboard as plain text

[supabase]

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[devin-ai-integration]

Devin Review found 1 new potential issue.

View 6 additional findings in Devin Review.

[devin-ai-integration]

🟡 Stale expandedNodes and activeFilter state when nodes prop changes

When the nodes prop changes (e.g., user runs a new extraction), the useEffect at MainContent.tsx:43-45 resets only selected but does not reset expandedNodes or activeFilter. This causes two problems: (1) nodes in the new result set will appear pre-expanded if they share indices with previously expanded nodes from a different extraction, and (2) if activeFilter was set to a node type (e.g., "pattern") that doesn't exist in the new results, the user sees an empty filtered list with no obvious explanation.

Suggested change

	useEffect(() => {
	setSelected(new Set());
	}, [nodes]);
	useEffect(() => {
	setSelected(new Set());
	setExpandedNodes(new Set());
	setActiveFilter("all");
	}, [nodes]);

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