feat(harmonia): native charts for report pages; bump Harmonia 2.1.0 -> 2.3.1

[delchev]

What

The Harmonia report templates rendered charts with Chart.js. Harmonia now ships its own native, theme-aware, accessible SVG charts (x-h-chart-{bar,line,pie,doughnut,polar-area,radar,scatter}), so this replaces Chart.js in the Harmonia stack with those directives and removes the external chart library from Harmonia-generated apps.

The chart type is a generation-time constant ($layoutType / the .report chart: value), so Velocity emits exactly one native directive per report - no runtime type switching.

Changes

• pom.xml - harmonia.version 2.1.0 -> 2.3.1 (the webjar ships the native charts + chartToImage/chartToSvg).
• ui/perspective/report/chart-view.html.template + chart-page.js.template - the in-SPA report chart page: <canvas> + new Chart(...) -> <div x-h-chart-{type}="chartConfig"> bound to a reactive chartConfig; print via Harmonia.chartToImage (was canvas.toDataURL).
• ui/perspective/report-file/index.html.template + report.js.template - the standalone .report page: same swap; the imperative renderChart() becomes a reactive buildChartConfig(); the per-page chart.umd <script> is dropped.
• ui/shell/index.html.template - drop the global chart.js <script> (native charts ship in the harmonia bundle already loaded by the shell).
• Recipe/doc comments (template/ui/report.js, module README.md, CLAUDE.md).

Scope: the chart.js webjar dependency is intentionally kept - the AngularJS report/dashboard stacks still use it. Only the Harmonia stack moves off Chart.js.

Verification

Built the fat jar and ran an isolated instance; drove the full generate pipeline with a minimal chart-report intent:

• generate 200, model->code 201, publish 200.
• Emitted report page renders <div x-ref="chartEl" x-h-chart-bar="chartConfig" class="size-full"> (the chart: bar -> x-h-chart-bar mapping resolves); emitted report.js carries chartConfig/buildChartConfig and no new Chart; 0 chart.umd scripts in the emitted page.
• Report index.html + report.js serve 200; /webjars/codbex__harmonia/dist/harmonia.min.js serves 200 and the bundle registers h-chart-bar.
• Fat jar bundles codbex__harmonia-2.3.1.jar.

Not yet exercised: the browser pixel-render of the SVG chart with live rows + the chartToImage print path - verified at the emitted-markup + served-resource + bundle-content layers, not a headless-browser render.

🤖 Generated with Claude Code