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/presenters/src/lib/pages/board.page.ts

@@ -9,6 +9,7 @@ import {
   Component,
   computed,
   effect,
+  HostListener,
   inject,
   input,
   signal,
@@ -43,6 +44,7 @@ import {
   boardFilterOf,
   IssuePriority,
   IssueSummary,
+  isTyping,
   overWip,
   POINT_SCALE,
   ReleaseStatus,
@@ -843,6 +845,23 @@ export class BoardPage {
     );
   }
 
+  /** `c`: new ticket (not while typing, nor with a drawer open). */
+  @HostListener('document:keydown', ['$event'])
+  protected onKey(event: KeyboardEvent): void {
+    if (
+      event.key !== 'c' ||
+      event.ctrlKey ||
+      event.metaKey ||
+      event.altKey ||
+      isTyping(event.target) ||
+      !this.project.canContribute() ||
+      document.querySelector('[role="dialog"]')
+    )
+      return;
+    event.preventDefault();
+    this.openCreate();
+  }
+
   protected openCreate(): void {
     const types = this.typeOptions();
     if (!types.some((t) => t.value === this.newType()))