add autocomplete

[Friendly-Banana]

Type of change(s)

• [ ] Bug fix
• [X] Feature / enhancement
• [ ] Infrastructure / tooling (CI, build, deps, tests)
• [ ] Documentation

What changed and why

• replace the text edit with an autocomplete field
• add completion logic in EventActivity

Tests performed

• create event with all reminders, new event type, colour, description, location, availability
• add new event, input two characters of old title, select event
• all fields copied from old event

After preview

Closes the following issue(s)

• Closes #579

Checklist

• [X] I read the contribution guidelines.
• [X] I manually tested my changes on device/emulator (if applicable).
• [ ] I updated the "Unreleased" section in CHANGELOG.md (if applicable).
• [X] I have self-reviewed my pull request (no typos, formatting errors, etc.).
• [x] All checks are passing.

I copied almost all fields, maybe not all should be assigned? #393 is now trivial, I can make a follow-up PR if you want

[naveensingh]

Please review the contribution guidelines. Issues labelled needs triage are not yet accepted or ready for development.

[Friendly-Banana]

Ok, so I can do #393 already and for this I just wait?

[naveensingh]

I'll check this soon.