added arrow icons to FlatLaf Icons.sketch and exported as SVGs

flatlaf-core/svg/ArrowButton-chevron.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="8" height="4" viewBox="0 0 8 4">
+  <polyline fill="none" stroke="#6E6E6E" points="0 4 4 0 8 4"/>
+</svg>

flatlaf-core/svg/ArrowButton-triangle.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="9" height="5" viewBox="0 0 9 5">
+  <polygon fill="#6E6E6E" fill-rule="evenodd" points="0 5 4.5 0 9 5"/>
+</svg>

flatlaf-core/svg/AscendingSortIcon-chevron.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="10" height="5" viewBox="0 0 10 5">
+  <polyline fill="none" stroke="#6E6E6E" points="1 4 5 0 9 4"/>
+</svg>

flatlaf-core/svg/AscendingSortIcon-triangle.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="10" height="5" viewBox="0 0 10 5">
+  <polygon fill="#6E6E6E" fill-rule="evenodd" points=".5 5 5 0 9.5 5"/>
+</svg>

flatlaf-core/svg/MenuArrowIcon-chevron.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="6" height="10" viewBox="0 0 6 10">
+  <polyline fill="none" stroke="#6E6E6E" points="1 1 5 5 1 9"/>
+</svg>

flatlaf-core/svg/MenuArrowIcon-triangle.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="6" height="10" viewBox="0 0 6 10">
+  <polygon fill="#6E6E6E" fill-rule="evenodd" points="0 .5 5 5 0 9.5"/>
+</svg>

flatlaf-core/svg/TreeCollapsedIcon-chevron.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="11" height="11" viewBox="0 0 11 11">
+  <polygon fill="#6E6E6E" fill-rule="evenodd" points="3 1 3 2.5 6 5.5 3 8.5 3 10 4.5 10 9 5.5 4.5 1"/>
+</svg>

flatlaf-core/svg/TreeCollapsedIcon-triangle.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="11" height="11" viewBox="0 0 11 11">
+  <polygon fill="#6E6E6E" fill-rule="evenodd" points="2 1 2 10 10 5.5"/>
+</svg>