Fix Table View first subthought overlapping parent when applied to the root context

[Copilot]

Activating Table View while the cursor is on a top-level thought caused the first subthought to overlap its parent instead of forming a proper second column. Subsequent subthoughts rendered correctly, isolating the bug to the root context.

Root cause

toggleTableView sets =view/Table on rootedParentOf(cursor), which for a top-level thought is the root (HOME_TOKEN). linearizeTree starts traversal at the root's children, so the root is never emitted as a node and never receives table metadata — tableCol1Widths gets no root entry. In usePositionedThoughts, the ancestorTableWidths reduce derives col2's x-offset from node.path[i - 2]; since the root appears in no Path, col2 resolves to offset 0 and lands on top of col1.

Changes

• src/hooks/usePositionedThoughts.ts — treat the root as a virtual table ancestor:
  • Precompute the root col1 width from depth-0 isTableCol1 nodes and register it under HOME_TOKEN in tableCol1Widths.
  • Reduce ancestorTableWidths over [HOME_TOKEN, ...node.path] so col2 picks up the root's col1 width.
  • Add ?? HOME_TOKEN fallbacks in the indentCursorAncestorTables col2/col2Child lookups and the width field.
• src/e2e/puppeteer/__tests__/table-view.ts — regression test pasting =view/Table at root and asserting the first subthought is offset right of the parent (subthought.x >= parent.x + parent.width).

Safety for non-root tables

tableCol1Widths.get(HOME_TOKEN) is 0/unset unless the root itself is a table (no depth-0 isTableCol1 nodes otherwise), so prepending HOME_TOKEN contributes a 0 offset and leaves existing table layouts unchanged.

[github-actions]

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