fix(email): collapse excessive blank lines in HTML-to-text conversion

[mqasimca]

Summary

Fixes excessive blank lines in HTML-to-text email conversion, particularly for table-heavy marketing emails (Yahoo, Azure, ChatGPT newsletters, etc.).

Problem: The StripHTML function was creating many consecutive blank lines when processing HTML emails that use nested tables for layout. Each </tr> tag added a newline, and the cleanup only collapsed 3+ newlines to 2, leaving many double-newlines.

Solution:

• Trim whitespace from each line first
• Then collapse consecutive empty lines to at most one blank line
• Preserves paragraph separation while eliminating excessive whitespace

Before

Did you just use your app password?




Hi Muhammad,




An app password for your account...

After

Did you just use your app password?

Hi Muhammad,

An app password for your account...

Changes

• internal/cli/common/html.go: Improved StripHTML function to collapse consecutive empty lines after trimming

Test Plan

• All existing TestStripHTML tests pass (22 test cases)
• Tested with Yahoo IMAP emails (3 emails)
• Tested with Microsoft Graph emails (10 emails)
• make ci passes (fmt, vet, lint, unit tests, security scan, vuln check)

Email Types Verified

Provider	Email Type	Result
Yahoo	Security notifications	✅ Clean
Yahoo	OpenPGP verification	✅ Clean
Microsoft	Marketing (Azure, ChatGPT)	✅ Clean
Microsoft	npm OTP notifications	✅ Clean
Microsoft	Nylas reminders	✅ Clean
Microsoft	Plain text / replies	✅ Clean