feat(icons): added asterism icon (#4687)

* feat(icons): added `asterism` icon

Adds asterism for issue #4077.
Also updates emoji category icon reference after smile rename.

* chore(icons): expand asterism metadata from PR suggestions

Apply curated tags, categories, and use-cases from automated
metadata review suggestions.

* Update icons/asterism.json

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

* Remove duplicate use-case entry in asterism.json

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Update use cases for asterism symbol in JSON

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Adjust metadata

---------

Co-authored-by: Eric Fennis <eric.fennis@gmail.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

.cspell/custom-words.txt

@@ -15,6 +15,7 @@ monstera
 
 # Search tags and terms used in icon and category metadata
 checkmark
+activitypub
 ageusia
 artboard
 barbeque
@@ -22,6 +23,7 @@ choy
 cicd
 ecommerce
 enby
+fediverse
 flexbox
 futbol
 gddr

icons/asterism.json

@@ -0,0 +1,31 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "KesleyDavid",
+    "karsa-mistmere"
+  ],
+  "use-cases": [
+    "Marking interoperable Fediverse profile links in social clients",
+    "Representing a three-star typographic symbol in publishing tools",
+    "Separating article sections with a decorative typographic mark",
+    "Representing star patterns in astronomy apps"
+  ],
+  "tags": [
+    "asterisk",
+    "fediverse",
+    "activitypub",
+    "symbol",
+    "typography",
+    "social",
+    "decentralized",
+    "federation",
+    "stars",
+    "three",
+    "ornament",
+    "punctuation",
+    "divider"
+  ],
+  "categories": [
+    "text"
+  ]
+}

icons/asterism.svg

@@ -0,0 +1,21 @@
+<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 2v8" />
+  <path d="m14.5 15 7 4" />
+  <path d="m14.5 19 7-4" />
+  <path d="M18 13v8" />
+  <path d="m2.5 15 7 4" />
+  <path d="m2.5 19 7-4" />
+  <path d="M6 13v8" />
+  <path d="m8.5 4 7 4" />
+  <path d="m8.5 8 7-4" />
+</svg>