More reliable support contact workflow and improved HTML signature compatibility

This release addresses two issues that affected composing emails and working with professional HTML signatures.

✉️ Contact Support works as expected

• Fixed the "Email Us" workflow: Clicking Email Us from the app or Settings now reliably opens a new message addressed to the Polymail Support team, without interrupting your ability to compose additional emails.

🖋️ Better HTML signature support

• Improved signature fidelity: HTML signatures pasted into the composer or signature editor now preserve their intended formatting more accurately, including table layouts, alignment, spacing, and other common formatting used in professional email signatures.

These improvements make it easier to use Polymail with existing corporate signatures while ensuring support is always just a click away.

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