feat: enhance spec regeneration management by project

- Refactored spec regeneration status tracking to support multiple projects using a Map for running states and abort controllers.
- Updated `getSpecRegenerationStatus` to accept a project path, allowing retrieval of status specific to a project.
- Modified `setRunningState` to manage running states and abort controllers per project.
- Adjusted related route handlers to utilize project-specific status checks and updates.
- Introduced a new Graph View page and integrated it into the routing structure.
- Enhanced UI components to reflect the current project’s spec generation state.

apps/ui/src/store/app-store.ts

@@ -210,6 +210,7 @@ export function formatShortcut(shortcut: string | undefined | null, forDisplay =
 export interface KeyboardShortcuts {
   // Navigation shortcuts
   board: string;
+  graph: string;
   agent: string;
   spec: string;
   context: string;
@@ -244,6 +245,7 @@ export interface KeyboardShortcuts {
 export const DEFAULT_KEYBOARD_SHORTCUTS: KeyboardShortcuts = {
   // Navigation
   board: 'K',
+  graph: 'H',
   agent: 'A',
   spec: 'D',
   context: 'C',