test(components): scope screenshots to content

[ManthanBhatt]

Issue number: resolves #30422

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What is the current behavior?

Several screenshot tests capture the full page even though the ion-toolbar in the header is only present to label the test page. As a result, visual changes to ion-toolbar force unrelated screenshot updates.

What is the new behavior?

This scopes an initial batch of screenshot assertions to ion-content so the toolbar is no longer included in screenshots where its appearance is not being tested.

• update badge basic screenshot coverage
• update several button screenshot tests
• update list-header, progress-bar, and toggle sizes screenshot tests

Does this introduce a breaking change?

• Yes
• No

Other information

• Added no new test cases; this updates existing screenshot assertions to better target the component under test.
• px eslint passed for the touched files.
• Playwright screenshot tests were not run locally because the required Playwright browser binaries are not installed in this environment.

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