Re-enable text selection in the "Search inside" panel

[Yoglina]

Previous versions of bookreader allowed the user to select-and-copy text within the "Search inside" panel. This is now no longer possible, as now the search results have now been turned into buttons.

Having the ability to select text from the "Search inside" panel is important because it allows users to quickly select-and-copy text snippets they may, for example, be quoting from a book. While some books do allow selecting text with the mouse from the page of the book, there are many that do not. Here is an example:
https://archive.org/details/sim_flag-of-our-union_1856-02-23_11_8/page/n2/mode/1up?q=%22On+this+particular+morning%22

Using this example, as it is now impossible to select-and-copy the text in the snippet of the search result, the user's only option is to download the Full Text of the book and Ctrl+F for what they were looking for. Or, to manually retype what is seen on the screen. Both options are needlessly more difficult compared to how it was before.

Proposed solution
Re-enable text selection from the "Search inside", making it how it was in the previous version before the search results were made into buttons.

[Hrittik20]

I’ve been looking into this and I think a good way to restore select-and-copy in the “Search inside” panel, without losing the accessibility benefits of using buttons, would be to change the click handling in the ia-book-search-results component so that it skips navigation when there is an active text selection (via window.getSelection().toString().trim()), and to explicitly allow user-select: text on the result items. That way, normal mouse clicks and keyboard activation would still behave exactly as they do now, but users could drag to highlight and copy the snippet text from a result without triggering a jump in the reader.

[anuragc0des]

Hi, I’ve opened a PR : #1519

that attempts to fix this issue by allowing text selection on the search result items while preserving the existing button click behavior. Please let me know if any changes are needed.