🧪 [testing improvement] Add widget test for SidePanelDialog

[LeanBitLab]

🎯 What:

Added a missing test file (test/widgets/side_panel_dialog_test.dart) to provide test coverage for SidePanelDialog, a custom stateless widget defining a dialog frame UI.

📊 Coverage:

The added test scenarios cover:

1. Default Rendering: Verifies that the internal Align correctly defaults to Alignment.centerLeft, checks the default shape (borderRadius), and verifies the Container respects the default width (250).
2. Alignment Adjustments (isRightSide): Verifies that supplying isRightSide = true accurately updates the Align to Alignment.centerRight and alters the BorderRadius appropriately (setting the right side to zero instead of the left).
3. Width Constraints: Asserts that supplying a custom width updates the underlying constraint successfully.

✨ Result:

The test fully covers SidePanelDialog ensuring confidence that styling modifications to this dialog wrapper won't quietly break visibility or dimension expectations. All added tests pass successfully!

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PR created automatically by Jules for task 15516445715521691482 started by @LeanBitLab

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