chore(popover): more storybook and test add

[productdevbook]

Description

Linked Issues

cc: #358

Additional context

[github-actions]

Thank you for following the naming conventions! 🙏

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	90.25%	11943 / 13233
🔵	Statements	90.25%	11943 / 13233
🔵	Functions	66.53%	342 / 514
🔵	Branches	91.16%	1052 / 1154

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
packages/components/popover/src/index.ts	100%	100%	100%	100%
packages/components/popover/src/popover.ts	100%	100%	100%	100%
packages/components/popover/src/popoverAnchor.ts	100%	100%	100%	100%
packages/components/popover/src/popoverArrow.ts	100%	100%	50%	100%
packages/components/popover/src/popoverClose.ts	97.5%	100%	100%	97.5%	28
packages/components/popover/src/popoverContent.ts	90.69%	85.71%	100%	90.69%	30-33
packages/components/popover/src/popoverContentImpl.ts	87.5%	100%	45.45%	87.5%	44-45, 51-52, 54-55, 57-58, 60-61, 63-64
packages/components/popover/src/popoverContentModal.ts	33.78%	100%	0%	33.78%	19-67
packages/components/popover/src/popoverContentNonModal.ts	55.4%	100%	100%	55.4%	30-40, 43-64
packages/components/popover/src/popoverPortal.ts	100%	100%	100%	100%
packages/components/popover/src/popoverTrigger.ts	100%	100%	100%	100%
packages/components/popover/src/props.ts	100%	100%	66.66%	100%
packages/components/popover/src/utils.ts	100%	100%	100%	100%
packages/components/popover/src/stories/Animated.vue	100%	100%	100%	100%
packages/components/popover/src/stories/Boundary.vue	100%	100%	100%	100%
packages/components/popover/src/stories/Controlled.vue	100%	100%	100%	100%
packages/components/popover/src/stories/CustomAnchor.vue	100%	100%	100%	100%
packages/components/popover/src/stories/ForcedMount.vue	100%	100%	100%	100%
packages/components/popover/src/stories/Modality.vue	100%	100%	100%	100%
packages/components/popover/src/stories/Nested.vue	100%	100%	100%	100%
packages/components/popover/src/stories/VControlled.vue	100%	100%	100%	100%
packages/components/popover/src/stories/WithSlottedTrigger.vue	100%	100%	100%	100%
packages/core/popper/src/index.ts	100%	100%	100%	100%
packages/core/popper/src/popperContent.ts	100%	96%	100%	100%
packages/core/popper/src/stories/Transition.vue	100%	100%	100%	100%
packages/core/portal/src/Portal.ts	98.43%	80%	100%	98.43%	57

Generated in workflow #987