add autocomplete for location

[Friendly-Banana]

Type of change(s)

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

What changed and why

• added autocomplete for location

Tests performed

• create events with locations
• check suggestions appear

Before & after preview

Closes the following issue(s)

• Closes Suggest locations #393

Checklist

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

I had to make item_dropdown.xml because in light mode the suggestions were gray on white and unreadable.