fix(render): watch props

[QuentiumYT]

Ajout du watch de toutes les props pour rerender les graphiques / tableaux.
Basé sur #44 avec moins de rewrite des options.

Correction aussi d'une erreur sur les composants unitaires qui avaient un shadow root quand même (erreur de CSS si ils étaient utilisés)

Closes #43
Closes #44
Resolves codegouvfr/react-dsfr#391

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[Copilot]

Pull Request Overview

This PR adds watchers on all component props to trigger chart/table re-renders and fixes the incorrect shadow root configuration for unit components. Key changes include:

• Adding a watcher on $props in multiple Vue chart components to automatically refresh the charts upon prop updates.
• Updating custom element definitions in chart files to remove duplicate shadow root settings.
• Correcting the shadow root configuration in unit component definitions as reflected in CONTRIBUTING.md.

Reviewed Changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated no comments.

File	Description
src/components/*.vue	Added watcher on $props to trigger re-rendering of charts
src/charts/*.js	Updated defineCustomElement calls to pass { shadowRoot: false } and simplified customElements.define calls
CONTRIBUTING.md	Updated custom element definition example to remove duplicate shadowRoot configuration

Comments suppressed due to low confidence (2)

CONTRIBUTING.md:52

• [nitpick] The custom element tag 'bar-line-chart' does not match the component name 'NewChart'. Please verify that this naming is intentional.

customElements.define('bar-line-chart', NewChartElement);

src/components/RadarChart.vue:122

• There are no tests covering the new watcher behavior on $props. Consider adding test cases to verify that prop changes correctly trigger the intended chart re-rendering.

watch: {