feat(icons): added square-alert Icon (#3687)

* Add square alert icon

Introduces a new 'square-alert' icon with associated metadata and SVG file. The icon represents alert or warning notifications within a square shape.

* Reorder elements in square-alert.svg

Moved the <rect> element before the <path> elements to adjust the SVG structure. No visual changes to the icon.

* Add newline at end of square-alert.json

linting fix

* changed path to line

* Add missing contributors to square-alert.json

* Update square-alert.json

* docs(square-alert): add use cases

* refactor(icons): rename square-alert to square-exclamation-point

* fix: review comments

* Update icons/square-exclamation-point.json

* Update square-exclamation-point.json

---------

Co-authored-by: Eric Fennis <eric.fennis@gmail.com>
Co-authored-by: Karsa <contact@karsa.org>

icons/square-exclamation-point.json

@@ -0,0 +1,31 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "viralcodex",
+    "colebemis",
+    "ericfennis"
+  ],
+  "use-cases": [
+    "Indicating application or system warnings or alerts",
+    "Highlighting important notifications that require user attention",
+    "Representing caution states for different components or elements",
+    "Marking validation errors, invalid input or configuration issues",
+    "Displaying diagnostic or troubleshooting information"
+  ],
+  "tags": [
+    "warning",
+    "alert",
+    "danger",
+    "exclamation mark",
+    "rectangle",
+    "square",
+    "notification",
+    "attention",
+    "important",
+    "caution"
+  ],
+  "categories": [
+    "notifications",
+    "shapes"
+  ]
+}

icons/square-exclamation-point.svg

@@ -0,0 +1,15 @@
+<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"
+>
+  <rect width="18" height="18" x="3" y="3" rx="2" />
+  <line x1="12" x2="12" y1="8" y2="12" />
+  <line x1="12" x2="12.01" y1="16" y2="16" />
+</svg>