fix: Animate the running state

[cursor]

Summary

Adds a visual pulsing animation to canvas nodes in the running state, making it much easier to identify active/working nodes on a busy canvas.

Problem: When many nodes are on a canvas, the static blue color for running nodes isn't visually distinctive enough to quickly spot which nodes are actively working.

Solution: Added a pulsing blue glow (box-shadow animation) to running nodes that provides subtle but noticeable motion, following existing animation patterns in the codebase.

Changes

• canvas-reset.css: Added sp-running-pulse keyframe animation and .sp-running class that creates a pulsing blue glow effect on the node container
• componentBase/index.tsx: Detects when any event section is in the "running" state and applies the sp-running animation class to the node wrapper
• componentHeader/index.tsx: Added isRunning prop; when true, applies Tailwind's animate-pulse to the compact view status dot for additional visual feedback

Visual effect

• Expanded view: The entire node card gets a subtle pulsing blue glow (box-shadow) that continuously animates
• Compact view: The status dot in the header also pulses

Closes #1525

  

[superplanehq-integration]

👋 Commands for maintainers:

• /sp start - Start an ephemeral machine (takes ~30s)
• /sp stop - Stop a running machine (auto-executed on pr close)