docs: add GitHub issue templates (bug report + feature request)

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,55 @@
+name: 🐛 Bug Report
+description: Report a bug or unexpected behavior
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting a bug! Please fill in the details below.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear description of the bug.
+      placeholder: What happened?
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: How can we reproduce this?
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. See error
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: If applicable, add screenshots.
+  - type: dropdown
+    id: browser
+    attributes:
+      label: Browser
+      options:
+        - Chrome
+        - Firefox
+        - Safari
+        - Edge
+        - Other
+  - type: input
+    id: version
+    attributes:
+      label: PinchChat Version
+      description: Commit hash or version tag
+      placeholder: e.g. main @ abc1234