feat: integrate global keyboard shortcuts across multiple components

- Added `KeyboardShortcutsProvider` to `RootLayout` for centralized keyboard shortcut management.
- Implemented `useGlobalKeyboardShortcuts` in `DailyPageClient`, `KanbanPageClient`, and `HomePageClient` to enhance navigation and task management with keyboard shortcuts.
- Updated `KeyboardShortcuts` component to render a modal for displaying available shortcuts, improving user accessibility.
- Enhanced `Header` component with buttons to open the keyboard shortcuts modal, streamlining user interaction.

src/app/layout.tsx

@@ -4,6 +4,7 @@ import "./globals.css";
 import { ThemeProvider } from "@/contexts/ThemeContext";
 import { JiraConfigProvider } from "@/contexts/JiraConfigContext";
 import { UserPreferencesProvider } from "@/contexts/UserPreferencesContext";
+import { KeyboardShortcutsProvider } from "@/contexts/KeyboardShortcutsContext";
 import { userPreferencesService } from "@/services/core/user-preferences";
 import { KeyboardShortcuts } from "@/components/KeyboardShortcuts";
 
@@ -39,12 +40,14 @@ export default async function RootLayout({
           initialTheme={initialPreferences.viewPreferences.theme}
           userPreferredTheme={initialPreferences.viewPreferences.theme === 'light' ? 'dark' : initialPreferences.viewPreferences.theme}
         >
-          <KeyboardShortcuts />
-          <JiraConfigProvider config={initialPreferences.jiraConfig}>
-            <UserPreferencesProvider initialPreferences={initialPreferences}>
-              {children}
-            </UserPreferencesProvider>
-          </JiraConfigProvider>
+          <KeyboardShortcutsProvider>
+            <KeyboardShortcuts />
+            <JiraConfigProvider config={initialPreferences.jiraConfig}>
+              <UserPreferencesProvider initialPreferences={initialPreferences}>
+                {children}
+              </UserPreferencesProvider>
+            </JiraConfigProvider>
+          </KeyboardShortcutsProvider>
         </ThemeProvider>
       </body>
     </html>