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/mcp/src/app/api/taskstream.schema.ts

@@ -3724,6 +3724,8 @@ export interface operations {
                 status?: string[];
                 /** @description Whatever each project calls its statuses */
                 category?: components["schemas"]["StatusCategory"][];
+                /** @description Matches key, title or description */
+                search?: string;
             };
             header?: never;
             path?: never;