feat(icons): added diagram-flow-horizontal, diagram-flow-vertical icons (#5125)

* feat(groups): added `chart` and `graph` groups

* feat(icons): added `mind-map` icon

* feat(icons): added `mind-map` icon

* feat(icons): added diagram-flow-* icons

* chore(icons): remove mind-map

* Update icons/diagram-flow-vertical.json

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Update icons/diagram-flow-horizontal.json

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Update icons/diagram-flow-vertical.json

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

icons/diagram-flow-horizontal.json

@@ -0,0 +1,35 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "linus-sch",
+    "karsa-mistmerea"
+  ],
+  "use-cases": [
+    "Showing relationships between concepts in visual planning tools",
+    "Structuring topics and subtopics in study notes",
+    "Planning branching workflows in diagram editors"
+  ],
+  "tags": [
+    "$group:graph",
+    "mind map",
+    "visualization",
+    "brainstorm",
+    "brainstorming",
+    "ideas",
+    "concepts",
+    "planning",
+    "hierarchy",
+    "branches",
+    "organization",
+    "tree",
+    "workflow",
+    "flowchart",
+    "process",
+    "process mapping",
+    "sequence"
+  ],
+  "categories": [
+    "design",
+    "charts"
+  ]
+}

icons/diagram-flow-horizontal.svg

@@ -0,0 +1,17 @@
+<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="M8 12h.5a3.5 3.5 0 013.5 3.5 3.5 3.5 0 003.5 3.5h.5" />
+  <path d="M8.5 12A3.5 3.5 0 0012 8.5 3.5 3.5 0 0115.5 5h.5" />
+  <rect x="16" y="16" width="6" height="6" rx="1" />
+  <rect x="16" y="2" width="6" height="6" rx="1" />
+  <rect x="2" y="9" width="6" height="6" rx="1" />
+</svg>

icons/diagram-flow-vertical.json

@@ -0,0 +1,28 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "$extends:diagram-flow-horizontal"
+  ],
+  "use-cases": [
+    "Showing top-to-bottom branching workflows in diagram editors",
+    "Organizing parent and child concepts in visual planning tools"
+  ],
+  "tags": [
+    "$group:graph",
+    "flowchart",
+    "workflow",
+    "hierarchy",
+    "branches",
+    "tree",
+    "parent",
+    "child",
+    "process",
+    "sequence",
+    "decision tree"
+  ],
+  "categories": [
+    "design",
+    "charts",
+    "development"
+  ]
+}

icons/diagram-flow-vertical.svg

@@ -0,0 +1,17 @@
+<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="M12 8.5a3.5 3.5 0 003.5 3.5 3.5 3.5 0 013.5 3.5v.5" />
+  <path d="M12 8v.5A3.5 3.5 0 018.5 12 3.5 3.5 0 005 15.5v.5" />
+  <rect x="16" y="16" width="6" height="6" rx="1" />
+  <rect x="2" y="16" width="6" height="6" rx="1" />
+  <rect x="9" y="2" width="6" height="6" rx="1" />
+</svg>