Adds a collapsible SVG line graph on weather session pages displaying
the evolution of all 4 indicators (Performance, Moral, Flux, Création
de valeur) across sessions, with per-session average scores, hover
tooltips, and a marker on the current session.
Also fixes pre-existing lint errors: non-null assertion on optional
chain in Header and eslint-disable for intentional hydration pattern
in ThemeToggle.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Reintroduced the WeatherAverageBar component in the WeatherSessionPage to display team averages. Updated the styling of the WeatherAverageBar for improved spacing. Enhanced the EvolutionIndicator component to use dynamic background colors for better visibility of status indicators.
