## Summary
This PR adds visual highlighting of search query matches in the
VersionPane component, making it easier for users to identify which
versions match their search criteria.

## Key Changes
- **New `HighlightMatch` component**: Created a reusable component that
highlights matching text segments with a yellow background (with dark
mode support). The matching is case-insensitive.
- **Version number highlighting**: Applied highlighting to version
numbers in the version list header
- **Version hash highlighting**: Applied highlighting to the short
commit hash (OID) displayed next to version numbers
- **Message highlighting**: Applied highlighting to version messages,
including those with reverted version information

## Implementation Details
- The `HighlightMatch` component performs case-insensitive substring
matching and wraps matched text in a `<mark>` element with Tailwind
classes (`bg-yellow-200 dark:bg-yellow-800 rounded-sm`)
- Search query is trimmed before being passed to the highlighting
function to avoid unnecessary whitespace
- The highlighting is applied consistently across all searchable text
fields in the version pane (version numbers, hashes, and messages)
- The implementation preserves existing message transformation logic for
"Reverted" messages while adding highlighting on top
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