ci(ui): add github workflows and issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug to help us improve
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report this bug!
+        
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear description of the bug
+      placeholder: "When I do X, Y happens instead of Z..."
+    validations:
+      required: true
+      
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. Scroll to '...'
+        4. See error
+    validations:
+      required: true
+      
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+      
+  - type: input
+    id: browser
+    attributes:
+      label: Browser
+      description: Which browser(s) are you experiencing the issue?
+      placeholder: "Chrome 120, Firefox 121, Safari 17..."
+      
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: Add screenshots if applicable
+      
+  - type: dropdown
+    id: severity
+    attributes:
+      label: Severity
+      options:
+        - Low - Minor inconvenience
+        - Medium - Affects functionality
+        - High - Major feature broken
+        - Critical - Site unusable
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a feature!
+        
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem/Use Case
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: "I'm always frustrated when..."
+      
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like
+    validations:
+      required: true
+      
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Any alternative solutions you've considered?
+      
+  - type: dropdown
+    id: priority
+    attributes:
+      label: Priority
+      options:
+        - Low - Nice to have
+        - Medium - Would improve experience
+        - High - Important for usability
+    validations:
+      required: true
+      
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Any other context, mockups, or screenshots