feat(theme): new utilities based on system tokens

[spike-rabbit]

Generate background, text, and border utility classes from Element system tokens and migrate Element usage to their replacements.

BREAKING CHANGE: The legacy color and status utility classes are removed. Run the Element update schematic to migrate classes in Angular templates.

Removed class	Replacement
bg-primary	background-accent
bg-secondary	background-neutral
bg-tertiary	background-4
bg-success	background-success
bg-info	background-information
bg-warning	background-warning
bg-danger	background-danger
bg-base-0	background-0
bg-base-1	background-1
bg-base-2	background-2
bg-base-3	background-3
bg-base-4	background-4
bg-base-info	background-information-subtle
bg-base-success	background-success-subtle
bg-base-caution	background-caution-subtle
bg-base-warning	background-warning-subtle
bg-base-danger	background-danger-subtle
bg-base-critical	background-critical-subtle
text-primary	text-accent
text-body	text-primary
text-tertiary	text-disabled
text-muted	text-disabled
text-info	text-information
status-success	text-success
status-info	text-information
status-caution	text-caution
status-warning	text-warning
status-danger	text-danger
status-critical	text-critical
status-neutral	text-disabled
status-success-contrast	text-on-success
status-info-contrast	text-on-information
status-caution-contrast	text-on-caution
status-warning-contrast	text-on-warning
status-danger-contrast	text-on-danger
status-critical-contrast	text-on-critical