Star → bookmark banner SVG also in the card title row (em.is_flagged
glyph) and the inbox toolbar's _starIcon / _starFilledIcon, so every
favorites affordance matches the chats sidebar bookmark.
Search dropdown gains a third suggestion kind:
- kind: 'email' rows surface emails from the snapshot whose subject or
sender name match the typed term (top 4, scored by startsWith vs
substring). Render row carries a small envelope glyph + bolded
subject + 'from name' on the right.
- Picking one closes the dropdown and expands that exact card via
_toggleCardPreview, scrolling it into view.
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