Crée dossier ui_transverse_components et commence à déplacer les composants

src/lib/components/Footer.svelte

src/lib/components/OpenGraph.svelte

src/lib/components/budget/BudgetDetailView.svelte

src/lib/components/test_cases/TestCaseFilters.svelte

src/lib/components/test_cases/TestCaseGraph.svelte

src/lib/components/test_cases/TestCaseGraphXlsxExport.svelte

...ib/components/ui_transverse_components/AnchorTitle.svelte

...lib/components/ui_transverse_components/SelectChip.svelte

...nents/ui_transverse_components/accordion/Accordion.svelte

...s/ui_transverse_components/accordion/AccordionItem.svelte

...omponents/ui_transverse_components/layercake/AxisY.svelte

...mponents/ui_transverse_components/layercake/Column.svelte

...onents/ui_transverse_components/piece_of_cake/Area.svelte

...nents/ui_transverse_components/piece_of_cake/AxisX.svelte

...nents/ui_transverse_components/piece_of_cake/AxisY.svelte

.../ui_transverse_components/piece_of_cake/BinaryTree.svelte

.../ui_transverse_components/piece_of_cake/DragSelect.svelte

...onents/ui_transverse_components/piece_of_cake/Html.svelte

...s/ui_transverse_components/piece_of_cake/MultiLine.svelte

...ui_transverse_components/piece_of_cake/PieceOfCake.svelte