add other tool buttons

src/assets/bezier_edit.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="24"
+   height="24"
+   viewBox="0 0 24 24"
+   version="1.1"
+   xmlns="http://www.w3.org/2000/svg">
+  <g>
+    <rect
+       style="fill:none;stroke:none;stroke-width:1.5"
+       width="24"
+       height="24"
+       x="0"
+       y="0" />
+    <!-- Bezier curve -->
+    <path
+       style="fill:none;stroke:#bfbfbf;stroke-width:2;stroke-linecap:round;stroke-opacity:1"
+       d="M 4,18 C 6,4 18,4 20,18" />
+    <!-- Control points -->
+    <circle cx="4" cy="18" r="2" style="fill:#bfbfbf;fill-opacity:1" />
+    <circle cx="20" cy="18" r="2" style="fill:#bfbfbf;fill-opacity:1" />
+    <!-- Handles -->
+    <line x1="4" y1="18" x2="6" y2="4" style="stroke:#bfbfbf;stroke-width:1;stroke-opacity:0.5" />
+    <line x1="20" y1="18" x2="18" y2="4" style="stroke:#bfbfbf;stroke-width:1;stroke-opacity:0.5" />
+    <circle cx="6" cy="4" r="1.5" style="fill:#bfbfbf;fill-opacity:0.7" />
+    <circle cx="18" cy="4" r="1.5" style="fill:#bfbfbf;fill-opacity:0.7" />
+  </g>
+</svg>

src/assets/line.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="24"
+   height="24"
+   viewBox="0 0 24 24"
+   version="1.1"
+   xmlns="http://www.w3.org/2000/svg">
+  <g>
+    <rect
+       style="fill:none;stroke:none;stroke-width:1.5"
+       width="24"
+       height="24"
+       x="0"
+       y="0" />
+    <line
+       style="fill:none;stroke:#bfbfbf;stroke-width:2.5;stroke-linecap:round;stroke-opacity:1"
+       x1="4"
+       y1="20"
+       x2="20"
+       y2="4" />
+  </g>
+</svg>

src/assets/polygon.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="24"
+   height="24"
+   viewBox="0 0 24 24"
+   version="1.1"
+   xmlns="http://www.w3.org/2000/svg">
+  <g>
+    <rect
+       style="fill:none;stroke:none;stroke-width:1.5"
+       width="24"
+       height="24"
+       x="0"
+       y="0" />
+    <polygon
+       style="fill:#bfbfbf;fill-opacity:0.5;stroke:#bfbfbf;stroke-width:2;stroke-linejoin:round;stroke-opacity:1"
+       points="12,3 20,9 17,19 7,19 4,9" />
+  </g>
+</svg>

src/assets/text.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="24"
+   height="24"
+   viewBox="0 0 24 24"
+   version="1.1"
+   xmlns="http://www.w3.org/2000/svg">
+  <g>
+    <rect
+       style="fill:none;stroke:none;stroke-width:1.5"
+       width="24"
+       height="24"
+       x="0"
+       y="0" />
+    <!-- Letter "T" made with paths -->
+    <!-- Horizontal top bar -->
+    <rect
+       style="fill:#bfbfbf;fill-opacity:1"
+       x="4"
+       y="4"
+       width="16"
+       height="3" />
+    <!-- Vertical stem -->
+    <rect
+       style="fill:#bfbfbf;fill-opacity:1"
+       x="10.5"
+       y="4"
+       width="3"
+       height="16" />
+  </g>
+</svg>