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/web/tracker/infrastructure/src/lib/adapters/graphql-issues.gateway.ts

@@ -87,6 +87,7 @@ export class GraphqlIssuesGateway extends IssuesGateway {
         assignedToMe: filter.assignedToMe,
         categories: filter.categories as never,
         limit: filter.limit,
+        search: filter.search?.trim() || null,
       })
       .pipe(
         map((d) => ({