feat: new react-embed actions (#23)

## Background

Adds new programmatic actions to the React embed component for advanced
integrations.

Closes:
- #3
- #5

## Changes

- Add `goTo({ page })` action to navigate to a specific page
- Add `createField({ type, page, x, y, width, height, value? })` action
to programmatically create annotation fields
- Add `clearFields({ fieldIds?, page? })` action to remove fields by ID
or page
- Add `getDocumentContent({ extractionMode? })` action to extract
document content (supports OCR)
- Introduce `ActionResult<TData>` discriminated union for typed action
responses
- Increase request timeout from 5s to 30s to support OCR extraction
- Add test coverage
- Update documentation

Author: bendersej

.changeset/long-paths-tell.md

@@ -0,0 +1,5 @@
+---
+"@simplepdf/react-embed-pdf": minor
+---
+
+Adds new programmatic actions to the React embed component for advanced integrations: goTo, createField, clearFields, getDocumentContent

.github/workflows/react.yaml

@@ -38,3 +38,6 @@ jobs:
 
       - name: Types
         run: npm run test:types
+
+      - name: Tests
+        run: npm test

.gitignore

@@ -10,4 +10,6 @@ chrome-extension/release/
 chrome-extension/release.zip
 
 .claude/
-.wrangler/
+.wrangler/
+
+coverage

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "typescript.tsdk": "node_modules/typescript/lib"
+}