feat(dashboard): nested-card document structure tree

[hallelx2]

Renders a document's section structure as a recursive, collapsible nested-card tree instead of a flat list.

• Builds a parent→children index from the flat /toc sections (each carries parent_id + depth — the same data the graph view uses), so no new endpoint or fetch.
• Collapsible nodes with a left guide line + indentation; top two levels open by default, deeper levels start collapsed.
• Landing-styled cards (rounded-2xl, hairline border, soft hover shadow); section titles link to the section detail page.
• Documents with no hierarchy degrade gracefully to a flat list of the same cards.

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Project	Deployment	Actions	Updated (UTC)
vectorless-web	Ready	Preview, Comment	Jul 3, 2026 12:12am

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c4e6122f-0950-4b6e-a11e-7e777c7db10f

📥 Commits

Reviewing files that changed from the base of the PR and between ec5a27c and 6f4e0c7.

📒 Files selected for processing (1)

• apps/web/app/(dashboard)/dashboard/documents/[docId]/page.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch halleluyaholudele/dashboard-nested-section-tree

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