Build QA sandbox page for mock data scenarios

[Abidoyesimze]

Epic

Page Design Issues (Dummy Data Only)

Description

• Create internal sandbox route to toggle mock scenarios globally
• Include presets for success, empty, loading, partial failure, and timeout
• Allow scenario switching per module (portfolio/history/transactions)
• Design spec (must use; measurable):
  • Tokens per Issue 3
  • Scenario controls grouped by module
  • Current scenario visibly displayed in page header
  • Sandbox route protected behind dev-only flag

Acceptance criteria

• Sandbox route created and documented
• Scenario presets switch UI states reliably
• Dev-only access guard works
• PR includes screenshots of each scenario preset

Suggested GitHub labels

frontend, qa, mock-data, priority-high

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[Menjay7]

Hi! I came across this issue and would love to work on it. I have experience with similar tasks and I'm confident I can investigate, implement a clean solution, and thoroughly test it before submitting a PR. If the issue is still open, I would appreciate it if you could assign it to me. Thank you!