improve typescript and linting usage across codebase

add ts-lit-plugin and eslint-typescript

disable no-invalid-css rule

fix a bunch of errors raised by eslint and typescript

run prettier & eslint on the remaining files

remove unused imports

split coll-index into index and info components...
and rename "coll" -> "item" for these.
also includes some fixes for previously-undocumented properties used on
non-ts elements.

extract labeled fields into separate component...
and make a few type improvements too

swap custom copy button for shoelace one

rename a few more missed things

src/pageentry.ts

@@ -320,8 +320,8 @@ class PageEntry extends LitElement {
     let inx = textContent.indexOf(this.query);
 
     if (inx < 0) {
-      let textLower = textContent.toLowerCase();
-      let queryLower = query.toLowerCase();
+      const textLower = textContent.toLowerCase();
+      const queryLower = query.toLowerCase();
 
       inx = textLower.indexOf(queryLower);