feat: add update-test, search, stats and assign commands with interactive menu

[d-claro]

What was done

• Added update-test command to edit existing test cases
• Added search command with dynamic filtering by keyword, assignee, area and state
• Added stats command to show a quick overview of test case states
• Added assign command to reassign a test case to a team member
• Restructured menu with hierarchical submenus for better navigation
• Added Test Cases submenu with all related options organised

New Commands

• update-test TC-001 — updates title, area and assignee of a test case
• search --keyword login — searches by keyword
• search --assignee Diogo — searches by assignee
• search --area Project/Login — searches by area
• search --state Active — searches by state
• stats — shows total, passed, failed, active and blocked test cases
• assign TC-001 — reassigns a test case to a new team member

Menu Changes

• Main menu reorganised into categories
• New Test Cases submenu with all related commands
• New History submenu
• Dynamic search with category selection

Notes

• Open for suggestions and feedback from the team.