Share modal preview/close use hardcoded slate rgba instead of semantic tokens

Area: Files, photos, gallery, ansi (audit p5) · Surface: /photos/album/{id} (Share to feed modal) · Dimension: law3-contrast · Severity: cosmetic

The preview backdrop and close-button hover use a fixed near-black slate tint. On dark themes this near-invisible tint produces almost no separation between the preview area and the card, weakening affordance (the empty-preview placeholder essentially disappears). Per Law 3 these should be semantic tokens that adapt per theme.

Evidence

platform/templates/photos/album.php:1497 `.ps-modal-preview{...background:rgba(15,23,42,.06)...}` and :1495 `.ps-modal-close:hover{background:rgba(15,23,42,.06);...}` — hardcoded slate-900 tints rather than `--color-bg-input` / a hover token. The same block does use semantic tokens elsewhere, so the hardcoded values are an inconsistency.

Suggested fix. Replace rgba(15,23,42,.06) with `var(--color-bg-input)` for the preview background and a themed hover token for .ps-modal-close:hover so the contrast holds across all themes.

Filed by the automated tenant-app audit and adversarially evidence-verified. Status: verified. Open — not yet actioned.