feat: global search and keyboard shortcuts

Ctrl/⌘ K (or /) opens a search over the projects and tickets of all my
projects, driven by the keyboard. g plus a letter moves between project
pages, c creates a ticket on the board, e edits the open ticket and ?
lists every shortcut. My work can now be searched by text through the API.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/infrastructure/src/lib/mongo/find.repositories.ts

@@ -161,6 +161,14 @@ export class MongoFindIssuesRepository extends FindIssuesRepository {
     if (filter.statuses?.length) query['status'] = { $in: filter.statuses };
     if (filter.categories?.length)
       query['statusCategory'] = { $in: filter.categories };
+    if (filter.search?.trim()) {
+      const pattern = new RegExp(escapeRegex(filter.search.trim()), 'i');
+      query['$or'] = [
+        { key: pattern },
+        { title: pattern },
+        { description: pattern },
+      ];
+    }
     const [docs, total] = await Promise.all([
       this.issues
         .find(query)