Add Legendre-Gauss basis for DGSEM and implement solver support for 1D/2D `TreeMesh`#1965

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DanielDoehring merged 32 commits into

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msl/legendre-gauss-basis

Feb 24, 2026

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97.35% of diff hit (target 97.13%)

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97.35% of diff hit (target 97.13%)

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