feat(frontend): truncate long operator descriptions with ellipsis and tooltip

[rbelavadi]

What changes were proposed in this PR?

Fixes the description truncation part of #4494 (operator name truncation was already addressed separately per maintainer comment).

Long operator descriptions in the property editor panel break the layout and make the panel harder to read. This change clamps the description text to 3 lines with an ellipsis, and shows the full description in a tooltip on hover using the existing nz-tooltip component already used throughout the project.

Before: long descriptions overflow with no limit

After: descriptions clamp to 3 lines with ..., full text visible on hover

Any related issues, documentation, discussions?

Fixes #4494

How was this PR tested?

Added 2 unit tests to operator-property-edit-frame.component.spec.ts:

• should truncate text with CSS line-clamp when description is long
• should show tooltip attribute on description container

All existing tests continue to pass.

Was this PR authored or co-authored using generative AI tooling?

Co-authored using Claude (Anthropic). Changes were reviewed and verified
by the author.

[github-actions]

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[xuang7]

Hi @rbelavadi, thanks for the PR! Since this PR includes a UI improvement, could you please add a screenshot to the PR description?

[Yicong-Huang]

Hi @rbelavadi thanks for the PR. For UI changes, please include screenshot before and after so reviewer can understand the change. Also please add test cases to guard this behavior programmatically. Thanks.

[rbelavadi]

Hi @rbelavadi thanks for the PR. For UI changes, please include screenshot before and after so reviewer can understand the change. Also please add test cases to guard this behavior programmatically. Thanks.

Hi, thank you for the feedback. I'm working on it right now.

[rbelavadi]

Hi @xuang7 and @Yicong-Huang,
I've updated the PR with before/after screenshots and added unit tests as requested. Also fixed a bug where the tooltip attributes were being rendered as plain text, they're now correctly placed as attributes on the container div.