♻️ refactor: migrate all web apps to Phosphor icons

Replace lucide-svelte with @manacore/shared-icons across all web apps
for consistent icon usage throughout the monorepo.

Apps migrated:
- calendar (12 files)
- contacts (1 file)
- matrix (16 files)
- nutriphi (7 files)
- presi (6 files)
- questions (9 files)
- skilltree (9 files)
- storage (16 files)
- todo (package.json only)

Key icon mappings:
- Trash2 → Trash
- ChevronLeft/Right/Up/Down → CaretLeft/Right/Up/Down
- Search → MagnifyingGlass
- Settings → Gear
- Loader2 → CircleNotch
- AlertCircle → WarningCircle
- ExternalLink → ArrowSquareOut
- LogOut → SignOut

apps/contacts/apps/web/package.json

@@ -53,7 +53,6 @@
 		"d3-selection": "^3.0.0",
 		"d3-zoom": "^3.0.0",
 		"date-fns": "^4.1.0",
-		"lucide-svelte": "^0.556.0",
 		"svelte-i18n": "^4.0.1"
 	},
 	"type": "module"

apps/contacts/apps/web/src/lib/components/ContactsToolbarContent.svelte

@@ -2,7 +2,7 @@
 	import { _ } from 'svelte-i18n';
 	import { onMount } from 'svelte';
 	import { PillViewSwitcher, FilterDropdown, type FilterDropdownOption } from '@manacore/shared-ui';
-	import { X } from 'lucide-svelte';
+	import { X } from '@manacore/shared-icons';
 	import { contactsFilterStore } from '$lib/stores/filter.svelte';
 	import { tagsApi, type ContactTag, type Contact } from '$lib/api/contacts';
 	import type { ContactFilter, BirthdayFilter } from '$lib/components/FilterBar.svelte';