feat(deps): Tailwind 3 → 4 + swap tailwindcss-animate for tw-animate-css

Ran the official @tailwindcss/upgrade tool:
- tailwind.config.ts → @theme directive in globals.css
- @tailwind base/components/utilities → @import 'tailwindcss'
- postcss.config switched from tailwindcss + autoprefixer to
  @tailwindcss/postcss (autoprefixer baked in)
- focus-visible:outline-none → focus-visible:outline-hidden (the v3
  utility was a footgun — outline still showed in forced-colors mode)

Reverted the migration tool's over-zealous variant="outline" →
variant="outline-solid" rename on CVA prop values; that rename was
meant for the Tailwind `outline:` utility, not our Button/Badge
component variants.

Swapped tailwindcss-animate (v3-style JS plugin) for tw-animate-css
(v4-native @import). Same utility surface (animate-spin, animate-in,
etc.), one fewer JS plugin in the bundle.

Fixed the upgrade tool's malformed dark variant
(@custom-variant dark (&:is(class *)) — `class` was being parsed as
a tag) to canonical &:where(.dark, .dark *).

Verified: tsc 0 errors, eslint 0 errors (16 pre-existing warnings),
vitest 1315/1315, next build clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/documents/eoi-generate-dialog.tsx

@@ -432,7 +432,7 @@ function PreviewRow({
       <dt className="w-32 shrink-0 text-xs text-muted-foreground">{label}</dt>
       <dd
         className={cn(
-          'flex-1 break-words inline-flex items-center gap-2',
+          'flex-1 wrap-break-word inline-flex items-center gap-2',
           missing
             ? 'text-rose-700 font-medium'
             : value

src/components/documents/signing-progress.tsx

@@ -83,7 +83,7 @@ export function SigningProgress({ documentId, signers }: SigningProgressProps) {
               )}
             </div>
           </div>
-          {idx < sorted.length - 1 && <div className="mb-6 h-0.5 w-8 flex-shrink-0 bg-border" />}
+          {idx < sorted.length - 1 && <div className="mb-6 h-0.5 w-8 shrink-0 bg-border" />}
         </div>
       ))}
     </div>