feat(analytics): add custom event tracking to Context, SkillTree, Planta, Questions

Add app-specific Umami event helpers and integrate tracking into:
- Context: 6 events (document create/delete/pin, space create/delete, AI generated)
- SkillTree: 3 events (skill create/delete with branch, XP added with level-up)
- Planta: 4 events (plant analyzed/created/deleted, plant watered)
- Questions: 5 events (question create/delete, research started, collection create/delete)

Updates ManaScore analytics from 3/5 to 4/5 for all four apps.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/context/apps/web/src/lib/stores/documents.svelte.ts

@@ -1,4 +1,5 @@
 import type { Document, DocumentType } from '$lib/types';
+import { ContextEvents } from '@manacore/shared-utils/analytics';
 import * as docsService from '$lib/services/documents';
 
 let documents = $state<Document[]>([]);
@@ -133,6 +134,7 @@ export const documentsStore = {
 			if (result.data) {
 				documents = [result.data, ...documents];
 				currentDocument = result.data;
+				ContextEvents.documentCreated(type);
 			}
 			return result;
 		} finally {
@@ -159,6 +161,7 @@ export const documentsStore = {
 	async delete(id: string) {
 		const result = await docsService.deleteDocument(id);
 		if (result.success) {
+			ContextEvents.documentDeleted();
 			documents = documents.filter((d) => d.id !== id);
 			if (currentDocument?.id === id) {
 				currentDocument = null;
@@ -173,6 +176,7 @@ export const documentsStore = {
 		const newPinned = !doc.pinned;
 		const result = await docsService.toggleDocumentPinned(id, newPinned);
 		if (result.success) {
+			ContextEvents.documentPinned(newPinned);
 			documents = documents.map((d) => (d.id === id ? { ...d, pinned: newPinned } : d));
 			if (currentDocument?.id === id) {
 				currentDocument = { ...currentDocument, pinned: newPinned };

apps/context/apps/web/src/lib/stores/spaces.svelte.ts

@@ -1,4 +1,5 @@
 import type { Space } from '$lib/types';
+import { ContextEvents } from '@manacore/shared-utils/analytics';
 import * as spacesService from '$lib/services/spaces';
 
 let spaces = $state<Space[]>([]);
@@ -39,6 +40,7 @@ export const spacesStore = {
 		const result = await spacesService.createSpace(userId, name, description);
 		if (result.data) {
 			spaces = [result.data, ...spaces];
+			ContextEvents.spaceCreated();
 		}
 		return result;
 	},
@@ -66,6 +68,7 @@ export const spacesStore = {
 		const result = await spacesService.deleteSpace(id);
 		if (result.success) {
 			spaces = spaces.filter((s) => s.id !== id);
+			ContextEvents.spaceDeleted();
 		}
 		return result;
 	},