feat: add an admin bar debugger and remove the Dashboard widget

[josephfusco]

Fixes #651

Core exposes no suspended flag, so the node calls Heartbeat suspended once a send is 10s overdue.

stateDiagram-v2
    state "Focused<br>♥ 58s" as Focused
    state "Fast<br>♥ 5s" as Fast
    state "Background or idle<br>♥ 120s" as Background
    state "Suspended<br>♥ Suspended" as Suspended
    state "Connection lost<br>♥ Connection lost" as Lost

    [*] --> Focused
    Focused --> Fast: interval('fast')
    Fast --> Focused: fast beats run out
    Focused --> Background: hidden, blurred, or 5 min idle
    Background --> Focused: activity
    Background --> Suspended: 10 min idle
    Suspended --> Focused: activity
    Focused --> Lost: third failed beat
    Lost --> Focused: a beat succeeds

    note right of Focused: each beat flashes the heart red and pulses it

    classDef lost fill:#fcf9e8,stroke:#996800,color:#996800
    class Lost lost

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Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 5.5
Used for: Assisting with the admin bar node, the widget removal and the state chart.

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