feat(Theme): update shadows on the Pentaho theme to the latest specs

[plagoa]

• Update default shadow definition on the Pentaho theme to the latest spec
• Add custom overrides to the HvDialog and HvTooltip components
• Add shadows to components that didn't have shadow before: HvCard and HvSnackbar

[Copilot]

Pull request overview

Updates the Pentaho theme’s shadow tokens and component-level shadow styling to match the latest visual specs across the shared styles package and the core component theme overrides.

Changes:

• Updated the Pentaho theme colors.shadow token to a new multi-layer shadow definition.
• Updated popper-based surfaces to the new shadow and added custom shadow overrides for HvDialog and HvTooltip.
• Added shadows to components that previously had none in the Pentaho core theme overrides (HvCard, HvSnackbarContent).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
packages/styles/src/themes/pentaho.ts	Updates the base Pentaho colors.shadow token used across the design system.
packages/core/src/themes/pentaho.ts	Aligns component/theme overrides (poppers, dialog, tooltip, card, snackbar content) with the updated shadow specs.

[zettca]

can we promote this to a variable, like we do in other "component"/internal tokens?
so it's easier to understand the PD mapping & its reusable?

ie

const shadows = {
  container: theme.colors.shadow, // we can also omit this
  elevated: `0 32....`
  modal: `0 ...`
}

[plagoa]

I'll make this change 👍