Highlight search results

### Checks

- [x] I have read the Wiki, searched the open issues, and still think this is a new feature.

### Explain the problem clearly and succinctly:

Mainly for larger notes.

### Describe the solution you'd like:

Highlight the matched word(s).

### Describe alternatives you've considered:

_No response_

### Additional context:

_No response_

No file, test, or entry point is identified in the issue. Start by locating the search-results implementation in the Android app and determine how matched words are displayed; done means the matched word(s) are visibly highlighted, especially in larger notes.

Written by the indexing model from the issue text.