fix: make TUI charts fill available width on wide terminals

[gnodet]

Summary

Claude Code on behalf of Guillaume Nodet

Charts previously used a fixed 60-point history buffer which left significant empty space on wide terminals. This PR makes charts dynamically size to fill the available width.

Changes

• MetricsCollector: Increase history buffer caps from 60 to 300 points so enough data accumulates for wider terminals
• OverviewTab: Increase MAX_SPARKLINE_POINTS from 60 to 300 (bar chart renderPoints was already computed dynamically from available width)
• EndpointsTab: Increase MAX_CHART_POINTS from 60 to 300 and compute renderPoints dynamically from the chart area width in all three chart methods (renderEndpointFlow, renderSingleEndpointChart, renderPayloadSizeChart)

Test plan

• Build passes locally
• Verified visually — sparklines and bar charts now fill their panels on wide terminals
• CI passes

🤖 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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⚙️ View full build and test results

[davsclaus]

Nice cleanup — the dynamic sizing logic is correct and the buffer increase is well-scoped.

One thing I noticed: CircuitBreakerTab has the same fixed-60 chart sizing (MAX_CHART_POINTS = 60 at line 52, renderPoints = MAX_CHART_POINTS at line 355) that this PR fixes in EndpointsTab. The CB history buffer in MetricsCollector is already bumped to 300 (it goes through recordEndpointSample → MAX_ENDPOINT_CHART_POINTS), but the render side is still hardcoded. Could be addressed in a follow-up.

Also a pre-existing nit: OverviewTab declares its own MAX_SPARKLINE_POINTS instead of referencing MetricsCollector.MAX_SPARKLINE_POINTS — they could drift.

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