v1.1: Organize duplicate tabs and save private tab sessions #5

Research often leaves many tabs open. Provide an explicit local view of duplicates and domain groups with restorable sessions.

This is part of the free, MIT-licensed v1.1.0 release. Implementation will arrive through a linked pull request; source availability does not imply a browser-store release.

Acceptance criteria

• Request tab access only when the user opens the organizer.
• Preview groups and exact duplicate URLs; close tabs only after an explicit selection/action.
• Save, name, delete and restore selected tab sessions locally.
• Use native tab groups when supported and explain Firefox limitations; never send tab metadata to a service.

Contributor starting points

src/app/sidepanel/tab-context.ts, src/entrypoints/background.ts, src/storage. Read AGENTS.md, CONTRIBUTING.md and PRIVACY.md first. Tests should exercise privacy boundaries and observable behavior. Please discuss implementation on this issue before opening overlapping work.

Privacy boundary

No analytics, advertising, account requirement or paid-only functionality. No personal email content may leave the computer. Private keys and decrypted tracking activity remain local. Tracking events have no time expiry and are removed after successful collection and signed acknowledgement.

Implementation status

Implemented on the v1.1 feature branch in PR #11, pending review and merge. Checked items describe implementation; real authenticated mail-layout and cross-browser limits are recorded in the public test report. This issue closes through the PR merge.