CAMEL-23648: camel-jbang - TUI add waterfall view and history tab fixes

[davsclaus]

Summary

• Add waterfall (Gantt chart) view to the History tab — press g to toggle a visual breakdown of per-processor elapsed time with colored bars (green→red logarithmic scale)
• Works in both trace mode (backlog-tracer) and history mode (last completed exchange)
• Extract color grading utility (colorForDuration) from StartupTab to TuiHelper for reuse
• Fix history/trace/error refresh to only fetch data from the selected integration, not all running integrations
• Fix TIME column on last (<--) entries — was showing exchange start time, now shows completion time (start + elapsed)

Test plan

• camel run waterfall-demo.yaml then camel monitor, press 7 (History tab), press g — waterfall appears with colored bars
• Press g again — returns to detail panel
• Run with --backlog-tracing, select exchange, Enter, then g — waterfall in trace detail view
• Verify bars are proportional to elapsed, colors grade from green (fast) to red (slow)
• Verify first step shows total exchange time (from matching last entry)
• With multiple integrations running, verify History tab only shows data from selected integration
• Verify TIME column on <-- entries shows completion time, not start time
• Verify PgUp/PgDn scrolls waterfall when many steps

Claude Code on behalf of Claus Ibsen

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🧪 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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