feat(tree): [tree,popover] Component dark theme adaptation

[lcy0620]

PR

feat(tree): [tree/popover] Component dark theme adaptation

PR Checklist

解决tree控件在暗黑主题下的高亮色，以及多处设置高亮色透明度色值会重叠加深问题
解决popover气泡卡片小三角图标色适配
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• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

• Style
  • Enhanced popover visuals by updating the arrow styling to match the overall theme background.
  • Refined the appearance of tree nodes by adjusting their background and hover effects, focusing on the left content area and icon interactions.
  • Updated the highlight color for tree nodes to support dynamic theming with a reference to a new variable.

[coderabbitai]

Walkthrough

This pull request updates the styling rules for the popover and tree components. A new CSS rule is added to style the .popper__arrow background using a CSS variable. Additionally, several tree node styles have been refined by removing outdated rules, updating selectors for left/right content areas, and replacing a static background color with a dynamic CSS variable.

Changes

File(s)	Change Summary
packages/theme/src/popover/index.less	Added a new CSS rule for .popper__arrow to set its background to var(--tv-Popover-bg-color).
packages/theme/src/tree/index.less, packages/theme/src/tree/vars.less	Revised tree node styling by adjusting background rules, modifying hover effects, and updating the highlight color variable from a static color to var(--tv-color-bg-active.

Possibly related PRs

• fix(popper-arrow): [tooltip, popover,dropdown] fix arrow's z-index, and remove popper-arrow class from popover,dropdown #2446: Involved adjustments to the .popper__arrow styling, which aligns with the current changes.
• fix(theme): [popover,tree] update popover/tree smb design #1990: Related to modifications in the popover component's styling, specifically in the index.less file.

Suggested reviewers

• zzcr

Poem

I'm a little rabbit hopping in delight,
Seeing popper arrows shine so bright.
Trees now wear a brand new hue,
Styling changes fresh as morning dew.
I nibble on code with a joyful bite!

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Reviewing files that changed from the base of the PR and between d032033 and b664439.

📒 Files selected for processing (1)

• packages/theme/src/tree/vars.less (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• packages/theme/src/tree/vars.less

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• GitHub Check: PR E2E Test (pnpm test:e2e3)

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[petercat-assistant]

Walkthrough

This PR adapts the tree and popover components for a dark theme. It addresses issues with highlight colors in the tree component under dark mode and adjusts the color of the popover arrow for better theme consistency.

Changes

Files	Summary
packages/theme/src/popover/index.less	Added background color for popover arrow to match dark theme.
packages/theme/src/tree/index.less	Adjusted highlight and hover background colors, and added SVG icon color changes for dark theme adaptation.
packages/theme/src/tree/vars.less	Updated tree node highlight background color variable for dark theme.