chore: define 2.2.1 manual QA checklist

[2sem]

Goal

Define a lightweight manual regression checklist for the 2.2.1 release.

Scope

• Cover translation input/output, history, share, speech recognition, ads, and app launch basics
• Include at least one happy path and one error/edge path where relevant
• Keep the checklist practical for each patch release

Acceptance Criteria

• The checklist is complete enough to run before shipping 2.2.1
• It clearly identifies the core user flows to verify
• It can be reused and adapted for future patch releases

Why

Patch releases need a fast but reliable manual gate.