fix(framework): ensure animation mode work

[nnaydenow]

• Set --_ui5-animation-mode CSS variable on configuration — AnimationMode.ts now calls createOrUpdateStyle
  (via document.adoptedStyleSheets) to keep --_ui5-animation-mode in sync with the configured animation mode, both
  on initial read and on every setAnimationMode call. Uses adopted stylesheets so the variable is not visible as an
  inline style in DevTools.

• Add CommonStyles.css with animation suppression — a new @container style(--_ui5-animation-mode: none) block
  sets transition-duration and animation-duration to 0s on every element inside a component's shadow root when
  animation mode is none, ensuring animations complete instantly while preserving their end state.

• Apply CommonStyles eagerly — getComponentStyles() now populates the stylesheet immediately from the
  pre-loaded packageMap instead of waiting for applyTheme to call updateComponentStyles, so the animation
  suppression rule is active from the very first render.

• Convert duration to a function — animate.ts exports duration as () => number instead of a static
  constant, so it reflects the current animation mode at call time. Updated all consumers (scroll.ts, slideDown.ts,
  slideUp.ts).

Test plan

• ConfigurationChange.cy.tsx — verify --_ui5-animation-mode is set on :root and updates correctly via
  setAnimationMode
• ConfigurationScript.cy.tsx — verify CSS variable matches the value from the config script
• ConfigurationURL.cy.tsx — verify CSS variable matches the value from URL params and that script config takes
  precedence over URL
• AnimationMode.cy.tsx — verify duration() returns 0 when mode is none and 400 otherwise; verify
  CommonStyles sheet is adopted into shadow roots and contains the --_ui5-animation-mode rule

[sap-ui5-webcomponents-release]

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