fix: some mobile search UI issues

[asjqkkkk]

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

Refine the user interface for mobile search results and the selection menu.

Bug Fixes:

• Display a default name for search results when the original name is empty.
• Correct the alignment and increase the tappable area of the search cancel button.
• Ensure the "No results" text in the selection menu uses the correct theme color instead of a hardcoded value.
• Center the icon within its allocated space in the search result cell.
• Add vertical spacing before the summary text in search result cells for better readability.
• Adjust the height of the mobile search text field.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses several UI issues in the mobile search and selection menu components, including layout adjustments, text handling, and theme integration.

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

File-Level Changes

Change	Details	Files
Improved the layout and text handling within the mobile search result cells.	Used translated default page name when the item display name is empty. Ensured the icon is properly sized and centered. Added vertical spacing between the path and the content summary.	frontend/appflowy_flutter/lib/mobile/presentation/search/mobile_search_cell.dart
Adjusted the mobile search text field height and refined the cancel button's layout and hit area.	Increased the overall height of the text field container. Made the cancel button's tap area opaque. Aligned the cancel button text to the left.	frontend/appflowy_flutter/lib/mobile/presentation/search/mobile_search_textfield.dart
Updated the 'No Results' text color in the mobile selection menu to use the theme's primary text color.	Switched from a hardcoded color to the theme's primary text color for the 'No Results' message.	frontend/appflowy_flutter/lib/mobile/presentation/selection_menu/mobile_selection_menu_widget.dart

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[sourcery-ai]

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

Overall Comments:

• Consider replacing magic numbers for dimensions and spacing with constants derived from the theme for better maintainability.
• Good job replacing the hardcoded color with a theme value; check if other similar instances exist elsewhere in the mobile UI.

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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[LucasXu0]

If we delete the removedIds, how do we perform the unreferenced reminder now?

[asjqkkkk]

putting removeIds here is not a correct way, however, I haven't thought of the most appropriate way to handle it

we'll ignore the unreferenced reminder now