feat: Lingua Franca-style dataflow view toggled by Tab

[lsk567]

Summary

Add a second dashboard view toggled by pressing Tab: a Lingua Franca-style dataflow diagram showing agents as reactors, message flows between them, logical delays, and cron jobs as LF timers.

Motivation

• Current flat view maximizes status info but doesn't show relationships between agents
• A dataflow view makes hierarchical relationships and event flow visible at a glance
• Cron jobs / scheduled events map naturally to LF timer concepts
• Two complementary views: flat (status-focused) and dataflow (relationship-focused)

Proposed Behavior

• Tab key toggles between flat view (current) and dataflow view
• Dataflow view shows:
  • Agents as reactor-style nodes
  • Message/event flows as directed edges between agents
  • Logical delays on connections
  • Cron jobs / scheduled events as LF-style timers
  • Agent status visible within each node
• View state persists during the session

Acceptance Criteria

• Tab key toggles between flat and dataflow views
• Agents rendered as nodes with status info
• Message flows shown as directed edges
• Scheduled events / cron jobs shown as timers
• Smooth transition between views
• Tests for view toggle and rendering

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