Blacklist to Automatically Skip Specific Users

Description:
Add the ability to create and manage a blacklist of LinkedIn profiles or criteria (e.g., specific companies, job titles, or names) to automatically exclude them from outreach. The blacklist will apply across lists and campaigns, ensuring these users are never contacted, even if they appear in future imports.

Why it matters:
Some users want to avoid reaching out to certain contacts — such as competitors, existing clients, colleagues, or irrelevant leads. A global blacklist saves time, reduces the risk of mistakes, and helps maintain brand integrity by ensuring unwanted profiles are consistently excluded from outreach efforts.