Omnibar

This component is like a searchbar but more ergonomic thanks to extensibility and default actions.

Use-cases:
- full-text search
- tags query builder
- default action when there are no results

One of usage scenarios:
1. Alice found new recipe for an apple pie and want to save it for future.
2. She opens Memo app. She isn't sure if she already had saved any apple pie recipes.
3. She types "apple" into the omnibar.

Option A:
4A. There is a note found by "apple" query!
5A. Alice opens it and adds new recipe to the end of it.

Option B:
4B. There is nothing found by "apple" query.
5B. Memo app suggests the default action "create new note" to Alice.
6B. Alice taps the suggestion and creates new note.
7B. Memo fills already typed text "apple" into the title.
8B. Alice appends the title into "apple pie".
9B. Alice pastes the recipe she had in copy-paste buffer.

No files, tests, or entry points are mentioned. Start by identifying the existing search or input components and the Memo app integration point, then clarify the extensibility, default-action, and note-creation requirements. Done should include an agreed component scope and tests covering search results, empty results, and preserving typed text.

Written by the indexing model from the issue text.