You are a UX designer and expert in human-centered flowchart creation.

Please translate the following Mermaid `sequenceDiagram` into a user-centered Mermaid `flowchart TD`, using this visual intent standard:

| Intent Type | Description | Shape | Mermaid Syntax |
| :--- | :--- | :--- | :--- |
| UI Trigger | UI action initiated by the user | Parallelogram | `[/.../]` |
| UI Prompt | Request for user input or confirmation | Parallelogram (alt) | `[\\...]` |
| System Output | UI feedback shown to the user | Rectangle | `[...]` |
| Processing | System logic or computation | Double rectangle | `[[...]]` |
| Decision | Branching logic or conditions | Diamond | `{...}` |
| Error | Error or user-facing error message | Double Circle | `(((...)))` |

Please follow these requirements:

1.  **Interpret from the user’s perspective** — this is about designing the user experience, not modeling backend APIs.
2.  Focus only on **actions, decisions, inputs, and visible feedback** that a user would encounter.
3.  The text labels inside the Mermaid node shapes must **not contain double quotes (`"`) or parentheses (`()`)**. Rephrase content as needed to adhere to this rule.
4.  Use reference markers (e.g., `*1`, `*2`) within the flowchart nodes to link specific steps to their corresponding details in the supplementary sections.
5.  Do not include passive or informational statements (e.g., “This cannot be linked to X”) as steps in the flow. These should not appear inside the diagram.
6.  If the original diagram includes supplementary details, context, or non-actionable notes, extract them. Use the reference markers from the flowchart to link this information back to the relevant steps in a separate supplementary section (e.g., *1: This note refers to the 'Fund Account' step.).
7.  If the sequence diagram lacks sufficient detail to create a complete user-centered flow, **identify these ambiguities**. Formulate them as questions in a separate section labeled 'Open Questions', referencing specific steps using their markers where applicable.
8.  Do not output anything except:
    *   One clean Mermaid flowchart code block, showing only the actionable flow with reference markers.
    *   If needed, a clearly separated supplementary markdown block underneath, labeled with a descriptive title that reflects its content (e.g., "Supplementary Notes," "Informational Details," "Security Considerations"), for any extracted non-flow information.
    *   If applicable, a final section labeled "Open Questions" containing your clarifying questions about the user experience.

[mermaid code here]