* Right-padding to account for scrollbar when showing search results.
* No 'max-width' anymore -- width adjusts to popup width.
* Description uses ellilpsis on overflow.
* Still needs info/expando (and need to remove title-text)
* Screenshots have 'object-fit:cover' to fill the space.
Unrelated: Hack for search category 'userstyles' (should be userstyles.org)
Unchecked => opens new tab for search page.
Checkbox hidden if inline results are shown (still shows link to "find styles" which opens a new tab by-default).
Main diff: Wrapped onDOMready() & SearchResults() function in IIFE closure.
* [X] const SearchResults = ... // should be inside a closure (IIFE @ Top)
* [X] SearchUserstyles should be firstLetterLowercase
* [X] Don't fetch category on load; use regexp to derive category. (left 'HEAD' code commented-out).
* [X] Don't use XMLHttpRequest() anymore (used in 3 places?): Use download() which accepts custom request params.
* [X] Remove unused getters ('getCurrentPage' & others?)
* [X] const BASE_USO_URL = 'https://userstyles.org'; @ top of searchResults closure. Refer elsewhere.
* [X] const searchUrl = new URL... should be a single multiline statement (new URL('...' +\ '...'
* [X] .innerHTML = ... // use .textContent = ... instead
* [X] Don't use `setAttribute` on 'disabled': $('..-prev').disabled = currentDisplayedPage <= 1 || loading
* [X] Don't use .indexOf() on strings, use .includes()
* [X] Move onDOMReady() code to top of file.
* Fetches 'category' for the current URL when popup is first loaded.
* Customizable styles have "Customize" button next to "Install"
* "Customize" button opens a new tab to the style page.
* Removed all console.log() statements (except when `catch()`ing errors).
