feat(web): migrate admin surface off bespoke CSS (migration phase 3, surface 3)

[Zach Dunn (zachdunn)]

Third phase-3 surface of the Tailwind + shadcn migration (follows #787/#789; plan in .context/2026-08-22-tailwind-shadcn-migration-plan.md, local doc).

What

• All six admin pages (workspaces, users, email, metrics, oauth, oauth/[clientId]) — static templates and script-generated HTML — moved to Tailwind utilities; legacy class names stay as DOM hooks.
• New shared class-string constants in admin-ui.ts (table cells, buttons, mini-lists) keep the repeated chrome DRY across pages.
• Admin CSS cut 889 → 200 lines (78%). What remains is deliberately state-driven or non-static: [data-state] status colors, JS-toggled .is-open rules, the 680px column collapse, the inline-SVG metrics chart styling, and the oauth-scopes fieldset.
• Cascade rule from feat(web): migrate workspace settings pages off bespoke CSS (migration phase 3, surface 2) #789 applied: the narrow selects governed by kept ul-select (width:100%, unlayered) use inline style="width:auto" rather than a utility that would silently lose.

Verification

• astro build, lint, admin-ui vitest 3/3 green.
• Visual audit against the local stack with an admin session: workspaces table + full expand panel (members/plan/limits/storage forms), metrics tiles + range chips (pressed state still violet-filled) + bar chart, users table with search, oauth table + new-app form + scopes fieldset, email previews table — all at parity with pre-migration baselines.
• Flagged for a prod glance: row-hover tint is bg-panel/55 replacing a color-mix() (visually close, not bit-identical), and the expand panel's nested list spacing is authored per-list now.

Screenshots attach via the managed comment.

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

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