Add Wiktionary extension

extensions/wiktionary/README.md

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+# Wiktionary
+
+An unofficial [Wiktionary](https://www.wiktionary.org) extension for Vicinae.
+
+## Features
+
+Implemented:
+- Search word definitions
+- Search selected or clipboard text
+- Option to filter and order result languages
+
+Missing:
+- Search etymology
+- Search Synonyms
+- Support links to other Wiktionary pages
+- Option to change base language
+
+## Thanks
+
+This is based on the [raycast-wiktionary](https://github.com/adielbm/raycast-wiktionary) extension by [adielbm](https://github.com/adielbm).

extensions/wiktionary/biome.json

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+{
+  "$schema": "https://biomejs.dev/schemas/2.3.2/schema.json",
+  "formatter": {
+    "enabled": true,
+    "lineWidth": 120,
+    "indentWidth": 2,
+    "indentStyle": "space"
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "double",
+      "semicolons": "always"
+    }
+  }
+}