fix: Schema compatibility - emoji → icon column rename

Production Outline DB uses 'icon' column instead of 'emoji' for documents
and revisions. Fixed all affected queries:

- documents.ts: SELECT queries
- advanced-search.ts: Search queries
- analytics.ts: Analytics + GROUP BY
- export-import.ts: Export/import metadata
- templates.ts: Template queries + INSERT
- collections.ts: Collection document listing
- revisions.ts: Revision comparison

reactions.emoji kept unchanged (correct schema)

Tested: 448 documents successfully queried from hub.descomplicar.pt

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

src/tools/documents.ts

@@ -34,7 +34,7 @@ const listDocuments: BaseTool<DocumentArgs> = {
       const direction = validateSortDirection(args.direction);
 
       let query = `
-        SELECT d.id, d."urlId", d.title, d.text, d.emoji,
+        SELECT d.id, d."urlId", d.title, d.text, d.icon,
           d."collectionId", d."parentDocumentId", d."createdById", d."lastModifiedById",
           d."publishedAt", d."createdAt", d."updatedAt", d."archivedAt",
           d.template, d."templateId", d."fullWidth", d.version,
@@ -125,7 +125,7 @@ const getDocument: BaseTool<GetDocumentArgs> = {
       }
 
       let query = `
-        SELECT d.id, d."urlId", d.title, d.text, d.emoji,
+        SELECT d.id, d."urlId", d.title, d.text, d.icon,
           d."collectionId", d."parentDocumentId", d."createdById", d."lastModifiedById",
           d."publishedAt", d."createdAt", d."updatedAt", d."archivedAt", d."deletedAt",
           d.template, d."templateId", d."fullWidth", d.version,