Polish mobile UI and editor workflows

tests/test_pdf_ai_edit_derivative.py

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+from src.agent_tools.document_tools import _strip_pdf_editor_markers
+
+
+def test_pdf_ai_edit_derivative_strips_pdf_plumbing():
+    raw = """<!-- pdf_source upload_id="0123456789abcdef0123456789abcdef.pdf" -->
+
+# Contract
+
+- **Name:** Felix <!-- field=Name type=text -->
+- Hello world <!-- annotation id=a1 page=1 x=1 y=2 w=3 h=4 kind=text -->
+"""
+
+    assert _strip_pdf_editor_markers(raw) == "# Contract\n\n- **Name:** Felix\n- Hello world"
+
+
+def test_pdf_ai_edit_derivative_strips_form_source_marker():
+    raw = """<!-- pdf_form_source upload_id="0123456789abcdef0123456789abcdef.pdf" fields="12" -->
+
+# Form
+"""
+
+    assert _strip_pdf_editor_markers(raw) == "# Form"