TUI: endpoints tab flow panel and mirrored activity chart

[davsclaus]

Summary

• Adds a flow panel below the endpoints table showing cumulative in/out message counts as an ASCII arrow diagram with the integration box at the centre
• Adds a 60-second sliding window mirrored activity chart: in-traffic (green) grows upward from the centre axis, out-traffic (blue) grows downward — matching the macOS Activity Monitor network graph style
• Sub-pixel rendering via Unicode block characters (▁▂▃▄▅▆▇█) gives smooth vertical resolution
• Y-axis labels (max / 0 / max) and x-axis time labels (-60s, -45s, -30s, -15s, now) matching the overview tab style
• Extracts the chart into a standalone MirroredSparkline widget, structured as a TamboUI-compatible Widget with builder pattern and full Javadoc, intended for upstream contribution to the TamboUI project

Test plan

• Run a Camel integration with camel-jbang and open the TUI monitor
• Navigate to the Endpoints tab and verify the flow panel appears below the table
• Verify the chart shows green bars growing upward for in-traffic and blue bars growing downward for out-traffic
• Verify x-axis labels (-60s … now) appear at the bottom of the chart
• Verify y-axis labels (max / 0 / max) appear on the left of the chart
• Verify the chart correctly scales to the terminal width and height

Claude Code on behalf of Claus Ibsen

🤖 Generated with Claude Code

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• dsl/camel-jbang/camel-jbang-plugin-tui

All tested modules (2 modules)

• Camel :: JBang :: Plugin :: TUI
• Camel :: Launcher :: Container

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