Port the post-streaming tree-heuristics pass to Rust (tree_heuristics.rs):
- fill_card_leading_image_width: a card's leading header image spans the
card width instead of leaving a white gap (160px image in a 252px card)
- fix_notification_badge_overlay: a badge authored as a flex sibling of an
icon becomes a corner-overlay circle, not a square beside the icon
- active nav-tab pill, card image corner clip, invisible text-band fill,
stacked-overlay-to-absolute, redundant colored wrapper strip
Add palette_harmonize.rs: retint the cool-slate neutral ramp toward the
page's temperature so a warm design no longer reads as off-palette gray.
Plus role-resolver / cleanup / scaffold / run refinements accumulated from
the glm-opus design-parity campaign.
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