feat(icons): Add handle-bottom-right icon (#1793)

* Add `handle-down-right` icon

* Rename handle-down-right.svg to handle-bottom-right.svg

* Rename handle-down-right.json to handle-bottom-right.json

* Add use-case for bottom-right resize handle

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Eric Fennis <eric.fennis@gmail.com>
Co-authored-by: Karsa <contact@karsa.org>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

icons/handle-bottom-right.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "ocavue"
+  ],
+  "tags": [
+    "mouse",
+    "grab",
+    "handle",
+    "move",
+    "drag",
+    "resize",
+    "corner"
+  ],
+  "use-cases": [
+    "Indicating the bottom-right resize handle of a resizable object"
+  ],
+  "categories": [
+    "design"
+  ]
+}

icons/handle-bottom-right.svg

@@ -0,0 +1,14 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="M21 8 8 21" />
+  <path d="m21 15-6 6" />
+</svg>