chore(deps-dev): bump styled-components from 6.3.12 to 6.4.0

[dependabot]

Bumps styled-components from 6.3.12 to 6.4.0.

Release notes

Sourced from styled-components's releases.

styled-components@6.4.0

Minor Changes

• b0f3d29: .attrs() improvements: props supplied via attrs are now automatically made optional on the resulting component (previously required even when attrs provided a default). Also fixes a bug where the attrs callback received a mutable props object that could be changed by subsequent attrs processing; it now receives an immutable snapshot.

• 2a973d8: Dropped IE11 support: ES2015 build target, inlined unitless CSS properties (removing @​emotion/unitless dependency), removed legacy React class statics from hoist and other unnecessary code.

• 9e07d95: Add createTheme(defaultTheme, options?) for CSS variable theming that works across RSC and client components.

  Returns an object with the same shape where every leaf is var(--prefix-path, fallback). Pass it to ThemeProvider for stable class name hashes across themes (no hydration mismatch on light/dark switch).

  const theme = createTheme({ colors: { primary: '#0070f3' } });
  // theme.colors.primary → "var(--sc-colors-primary, #0070f3)"
  // theme.raw → original object
  // theme.vars.colors.primary → "--sc-colors-primary"
  // theme.resolve(el?) → computed values from DOM (client-only)
  // theme.GlobalStyle → component that emits CSS var declarations

  vars exposes bare CSS custom property names (same shape as the theme) for use in createGlobalStyle dark mode overrides without hand-writing variable names:

  const { vars } = createTheme({ colors: { bg: '#fff', text: '[#000](https://github.com/styled-components/styled-components/issues/000)' } });
  const DarkOverrides = createGlobalStyle@media (prefers-color-scheme: dark) { :root { ${vars.colors.bg}: [#111](https://github.com/styled-components/styled-components/issues/111); ${vars.colors.text}: #eee; } };

  Options: prefix (default "sc"), selector (default ":root", use ":host" for Shadow DOM).

• 79cc7b4: Add first-class CSP nonce support. Nonces can now be configured via StyleSheetManager's nonce prop (recommended for Next.js, Remix), ServerStyleSheet's constructor, <meta property="csp-nonce"> (Vite convention), <meta name="sc-nonce">, or the legacy __webpack_nonce__ global.

• b0f3d29: Rearchitect createGlobalStyle to use shared stylesheet groups.

  All instances of a createGlobalStyle component now share a single stylesheet group, registered once at definition time. This fixes unmounting one instance removing styles needed by others (#5695), styles scattering after remount (#3146), and group ID leaks during SSR (#3022).

  CSS injection order is now fully determined at definition time (lower group ID = earlier in stylesheet). Render order no longer affects CSS order. Keyframes defined before a component correctly appear before that component's rules.

  Also fixes: O(n^2) performance regression in jsdom test environments from unbounded rule accumulation, and stale static global styles during client-side HMR (effect deps now include the globalStyle reference so module re-evaluation triggers re-injection).

• b0f3d29: Significant render performance improvements via three-layer memoization and hot-path micro-optimizations. Client-only; server renders are unaffected.

  Re-renders that don't change styling now skip style resolution entirely. Components sharing the same CSS (e.g., list items) benefit from cross-sibling caching. Hot-path changes include forEach → for/for...of, template literal → manual concat, and reduced allocations.

... (truncated)

Commits

• bf65d5d Version Packages
• 9c871dd refactor: optimize client reference detection placement in flatten()
• 36fd9bc fix: prevent crash when interpolating client components in RSC styled templates
• b67d5cf test: reference shared LIMIT constant for dynamicNameCache bound assertion
• 4eb32af test: assert warnTooManyClasses fires before dynamicNameCache eviction
• 74e8b76 chore: remove unused runtime dependencies
• 553cbb4 fix: bound dynamicNameCache to prevent memory leak
• 248edc3 perf: unified CSS preprocessor, snapshot audit fixes (#5721)
• 67c528f feat(sandbox): perf stress tests, shared sidebar, tailwind benchmark (#5719)
• 4c0b72a fix(types): ref callback inference with spread props, type perf, TS 6.0 compat
• Additional commits viewable in compare view

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