feat(icons): redesign icons

- fill full frame instead of ninety percent of it
- make all joins and caps rounded
- add white background to all icons

src/static/checkmark.svg

@@ -3,13 +3,16 @@
      viewBox="-1 -1 2 2"
      xmlns="http://www.w3.org/2000/svg"
      xmlns:xlink="http://www.w3.org/1999/xlink">
+  <rect x="-1" y="-1" width="2" height="2" fill="white"/>
   <path stroke-width="0.2"
         stroke="black"
+        stroke-linejoin="round"
+        stroke-linecap="round"
         fill="none"
         d="
-           M -0.724  0.181
-           L -0.362  0.543
-           L  0      0.181
-           L  0.362 -0.181
-           L  0.724 -0.543"/>
+           M -0.8  0.2
+           L -0.4  0.6
+           L  0    0.2
+           L  0.4 -0.2
+           L  0.75 -0.55"/>
 </svg>

src/static/cross.svg

@@ -3,20 +3,15 @@
      viewBox="-1 -1 2 2"
      xmlns="http://www.w3.org/2000/svg"
      xmlns:xlink="http://www.w3.org/1999/xlink">
-  <path stroke="none"
-        fill="black"
+  <rect x="-1" y="-1" width="2" height="2" fill="white"/>
+  <path stroke="black"
+        stroke-width="0.2"
+        stroke-linejoin="round"
+        stroke-linecap="round"
+        fill="none"
         transform="rotate(45)"
-        d="M  0.1  0.9
-           L  0.1  0.1
-           L  0.9  0.1
-           L  0.9 -0.1
-           L  0.1 -0.1
-           L  0.1 -0.9
-           L -0.1 -0.9
-           L -0.1 -0.1
-           L -0.9 -0.1
-           L -0.9  0.1
-           L -0.1  0.1
-           L -0.1  0.9
-           Z"/>
+        d="M  0    0.9
+           L  0   -0.9
+           M  0.9  0
+           L -0.9  0"/>
 </svg>

src/static/hourglass.svg

@@ -3,16 +3,17 @@
      viewBox="-1 -1 2 2"
      xmlns="http://www.w3.org/2000/svg"
      xmlns:xlink="http://www.w3.org/1999/xlink">
+  <rect x="-1" y="-1" width="2" height="2" fill="white"/>
   <path stroke-width="0.2"
         stroke="black"
         stroke-linejoin="round"
         fill="none"
         d="
-           M  0     -0.536
-           L  0.536 -0.536
+           M  0     -0.636
+           L  0.636 -0.636
            L  0      0
-           L -0.536  0.536
-           L  0.536  0.536
-           L -0.536 -0.536
-           L  0     -0.536"/>
+           L -0.636  0.636
+           L  0.636  0.636
+           L -0.636 -0.636
+           L  0     -0.636"/>
 </svg>