fix: make the link align center while sitename is empty

[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

Bug Fixes:

• Do not render the site name text or its surrounding spacing when the siteName is empty, fixing link alignment

[sourcery-ai]

Reviewer's Guide

Introduce a hasSiteName flag and conditionally render the site name and its spacing in the LinkEmbedBlockComponent to ensure the URL is centered when no site name is provided.

File-Level Changes

Change	Details	Files
Conditional rendering of siteName and spacing to adjust link alignment	Add hasSiteName boolean to check if linkInfo.siteName is non-empty Wrap the siteName FlowyText and VSpace inside an if (hasSiteName) block Remove unconditional rendering of siteName and associated spacer	frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/link_embed/link_embed_block_component.dart

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[sourcery-ai]

Hey @asjqkkkk - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

suggestion: Consider trimming siteName when checking emptiness

Use linkInfo.siteName?.trim().isNotEmpty to avoid treating whitespace-only siteName as non-empty and rendering blank spacers or text.

Suggested change

	final hasSiteName = linkInfo.siteName?.isNotEmpty ?? false;
	final hasSiteName = linkInfo.siteName?.trim().isNotEmpty ?? false;