feat: add unknown .mrpack install warning modal (#5942)

* Update modpack button copy

* Change outlined button style for standard buttons

* add unknown pack warning modal

* implementation

* Redo download toasts

* prepr

* improve hit area of window controls

* implement "don't show again"

* prepr

* duplicate modal ref declarations

* increase spacing of progress items

* address truman review

packages/assets/icons/circle-arrow-right.svg

@@ -0,0 +1,17 @@
+<!-- @license lucide-static v0.562.0 - ISC -->
+<svg
+  class="lucide lucide-circle-arrow-right"
+  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"
+>
+  <circle cx="12" cy="12" r="10" />
+  <path d="m12 16 4-4-4-4" />
+  <path d="M8 12h8" />
+</svg>