Fix shortlink resolution bug

[EthanThatOneKid]

Previously

The shortlink resolver wasn't working correctly. It would try to match invalid paths to shortlinks.

Now

The shortlink resolver is fixed! It correctly identifies shortlinks by looking at each segment (part separated by "/") within the path, from the beginning to the end of the string. So, now searching for "/colors" will find the correct shortlink instead of resolving incorrectly to "/c".

src/lib/server/links/resolve.ts

    let id = pathname.slice(1) as ID;
    while (id.length > 0 && !shortlinks[id]) {
-      id = id.slice(0, id.lastIndexOf('/')) as ID;
+      const slashIndex = id.lastIndexOf('/');
+      if (slashIndex === -1) {
+        break;
+      }
+
+      id = id.slice(0, slashIndex) as ID;
    }

    if (!shortlinks[id]) {

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