chore: various UI improvements and fixes

Calendar:
- Fix EventDetailModal and QuickEventOverlay component updates
- Update TodoDetailModal and TodoItem components
- Remove unused settings section code
- Fix network page styling

Todo Backend:
- Improve task service validation

Shared UI:
- Update Card, DataCard, Input components with improvements
- Enhance TagBadge with better color handling
- Fix TagEditModal and TagList components
- Update PillNavigation and PillDropdown styling
- Add NetworkGraph improvements
- Update CommandBar, FormModal, AppsPage components
- Fix chart types and GlobalSettingsSection

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/shared-ui/src/command-bar/CommandBar.svelte

@@ -102,7 +102,7 @@
 	let creating = $state(false);
 	let selectedIndex = $state(0);
 	let searchTimeout: ReturnType<typeof setTimeout>;
-	let inputElement: HTMLInputElement;
+	let inputElement = $state<HTMLInputElement | null>(null);
 
 	// Computed create preview
 	let createPreview = $derived(
@@ -260,6 +260,7 @@
 		role="dialog"
 		aria-modal="true"
 		aria-label="Suchen"
+		tabindex="-1"
 		onclick={handleBackdropClick}
 		onkeydown={handleKeydown}
 	>