Build first NiceGUI analytics dashboard

[BytecodeBrewer]

Goal

Build the first NiceGUI-based analytics dashboard for ARGUS.

Why

Tkinter was useful as an early local GUI prototype. ARGUS now needs a more dashboard-oriented interface that can grow toward web-ready analytics workflows.

NiceGUI should become the next UI direction for displaying historical data, metrics and charts.

Scope

• Add NiceGUI as a project dependency
• Create a first NiceGUI app entry point
• Display historical data from the real data client
• Display Sprint 2 analytics metrics:
  • cumulative return
  • strongest / weakest movement
  • rolling volatility
• Show at least one useful chart or visual component
• Keep metric logic outside the UI layer
• Keep Tkinter available as legacy/prototype if needed

Acceptance criteria

• NiceGUI app can be started locally
• Dashboard displays historical data
• Dashboard displays the Sprint 2 metrics
• At least one chart or visual analytics component is shown
• UI calls services/metrics instead of calculating everything inside callbacks
• Tkinter is not removed unless explicitly decided
• Existing tests still pass

Note

Priority: Must