fix(summary): align enhanced heading styles

[ComputelessComputer]

Scope completed enhanced summaries to the same heading scale used by streaming summaries.

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Note

Low Risk
Low risk: this is a scoped styling change that adds an optional className passthrough to NoteEditor and applies CSS overrides for enhanced summaries, with no data/auth logic changes.

Overview
Enhanced summaries now render headings at a smaller, consistent scale. The desktop enhanced note editor passes a new className (enhanced-summary-editor) into NoteEditor.

NoteEditor now accepts an optional className prop and merges it onto the ProseMirror root (tiptap) class, enabling targeted CSS. New CSS rules under .tiptap.enhanced-summary-editor override h1–h6 font sizes/line-heights to match the intended summary heading scale.

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