feat(web): migrate screenshots-by-path surface off bespoke CSS (migration phase 3, surface 4)

[Zach Dunn (zachdunn)]

Fourth phase-3 surface (follows #787/#789/#791; plan in .context/2026-08-22-tailwind-shadcn-migration-plan.md, local doc).

What

• ScreenshotsByPath.tsx + screenshots.astro: the .wsp* families (project/group/drill layout, grid, filter + suggestions, segmented toggle, empty states, skeletons) moved to Tailwind utilities; legacy class names stay as DOM hooks. The .wsp-project + .wsp-project hairline became an index-based bordered prop (React map output has no sibling selector); hover/focus disclosure uses group-hover:/group-focus-visible:; @media (hover:none) via arbitrary variant.
• Deliberately kept as CSS: tile/thumb aspect-ratio chrome (driven by JS-set --wsp-ar/--wsp-strip-h custom properties) and the entire flip-aware hover-preview block (fix(web): flip-aware hover-preview placement + keyboard focus parity #776) — placement logic and its CSS untouched.
• Shared rules (ws-empty-state, ws-skel, wft-*) untouched — they serve other surfaces.

Verification

• astro build, lint green; screenshots vitest suites 49/49 (includes the fix(web): flip-aware hover-preview placement + keyboard focus parity #776 placement tests).
• Visual audit against the local stack with a signed-in session on the migrated DOM: layout, filter bar, mode pills, group rhythm all at parity — including one regression caught and fixed in audit (the root .wsp grid/32px-gap rule was deleted without its replacement utilities, collapsing between-project spacing).
• Hover-preview could not be exercised locally (fixture thumbnails are broken images without cdn-cgi transforms; the preview never mounts) — logic is untouched and unit-tested, but worth a prod hover after merge.

Screenshot attaches via the managed comment.

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[uploads-sh]

/account/workspaces/dev-demo/screenshots · after

_{Maintained by uploads.sh · add media: uploads put <file> --pr 793 · docs}

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