feat(04-03): add AddDocumentModal, PdfViewer, and document detail page

- Create AddDocumentModal: searchable forms library list + custom file picker
- Wire Add Document button into ClientProfileClient in Documents section header
- Update DocumentsTable: document names now link to /portal/documents/{id}
- Create PdfViewer with page nav, zoom, and download controls (pdfjs worker via import.meta.url)
- Create /portal/documents/[docId] page: server component with auth check, doc/client query
- Add documentsRelations and clientsRelations to schema.ts for db.query with-relations support
- Build verified: /portal/documents/[docId] route present, no errors

teressa-copeland-homes/src/lib/db/schema.ts

@@ -1,4 +1,5 @@
 import { pgEnum, pgTable, text, timestamp } from "drizzle-orm/pg-core";
+import { relations } from "drizzle-orm";
 
 export const users = pgTable("users", {
   id: text("id").primaryKey().$defaultFn(() => crypto.randomUUID()),
@@ -42,3 +43,11 @@ export const documents = pgTable("documents", {
   formTemplateId: text("form_template_id").references(() => formTemplates.id),
   filePath: text("file_path"),
 });
+
+export const documentsRelations = relations(documents, ({ one }) => ({
+  client: one(clients, { fields: [documents.clientId], references: [clients.id] }),
+}));
+
+export const clientsRelations = relations(clients, ({ many }) => ({
+  documents: many(documents),
+}));