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>

apps/api/schema.gql

@@ -900,7 +900,16 @@ type Query {
   """
   Tickets across all my projects: assigned to me (default) or any (e.g. categories [QA])
   """
-  myIssues(assignedToMe: Boolean! = true, categories: [StatusCategory!], limit: Int! = 50, offset: Int! = 0, statuses: [String!]): IssuePage!
+  myIssues(
+    assignedToMe: Boolean! = true
+    categories: [StatusCategory!]
+    limit: Int! = 50
+    offset: Int! = 0
+
+    """Matches key, title or description (global search)"""
+    search: String
+    statuses: [String!]
+  ): IssuePage!
 
   """My notifications, newest first, and how many are unread"""
   myNotifications(limit: Int! = 30, unreadOnly: Boolean! = false): MyNotifications!