Update auto labeling

- Fix labeling of issues not using word boundaries
- Add new PR by branch name labels

.github/issues-auto-labels.yml

@@ -14,7 +14,7 @@
     - '(🐧 Linux)'
 
 🦊 Firefox:
-    - '(firefox|mozilla)'
+    - '\b(firefox|mozilla)\b'
 
 📱 Mobile:
-    - '(iphone|ios|android|📱 Termux)'
+    - '\b(iphone|ios|android|📱 Termux)\b'

.github/pr-auto-labels-by-branch.yml

@@ -34,6 +34,9 @@
 🦊 Firefox:
 - head-branch: ['\bfirefox\b']
 
+🧑‍🤝‍🧑 Group Chat:
+- head-branch: ['\bgroups?\b']
+
 🖼️ Image Gen:
 - head-branch: ['\bimage-gen\b']
 
@@ -58,6 +61,9 @@
 📜 Prompt:
 - head-branch: ['\bprompt\b']
 
+🧠 Reasoning:
+- head-branch: ['\breasoning\b', '\breason\b', '\bthinking\b']
+
 🚚 Refactor:
 - head-branch: ['\brefactor(s|ed)?\b']