chore: adjust popover shadows

[richardshiue]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Chores:

• Update shadow color constants to use a more opaque black color for dark mode popovers

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adjusts the shadow colors for the dark theme popovers. The opacity of the dark theme shadows has been increased to improve visibility.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Adjusted the shadow colors for dark theme popovers.	Increased the opacity of the darkSmall shadow color from 0x5C000000 to 0x7A000000. Increased the opacity of the darkMedium shadow color from 0x5C000000 to 0x7A000000.	frontend/appflowy_flutter/packages/flowy_infra_ui/lib/src/flowy_overlay/appflowy_popover.dart

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[sourcery-ai]

Hey @richardshiue - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a comment explaining why the shadow colors were changed.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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