Implement onboarding, update management, and version 2.1.0 enhancements

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: "🐛 Bug Report"
+description: Report a bug or unexpected behavior
+labels: [ "bug" ]
+body:
+- type: textarea
+  id: description
+  attributes:
+    label: Description
+    description: What happened? What did you expect to happen?
+  validations:
+    required: true
+- type: textarea
+  id: steps
+  attributes:
+    label: Steps to Reproduce
+    description: How can we reproduce the issue?
+    placeholder: |
+      1. Open YouTube in Safari
+      2. Play a video
+      3. Switch to another tab
+      4. ...
+  validations:
+    required: true
+- type: input
+  id: macos-version
+  attributes:
+    label: macOS Version
+    placeholder: "e.g. 15.4"
+  validations:
+    required: true
+- type: input
+  id: safari-version
+  attributes:
+    label: Safari Version
+    placeholder: "e.g. 18.3"
+  validations:
+    required: true
+- type: input
+  id: app-version
+  attributes:
+    label: AutoPiP Version
+    description: Shown in the app menu under "About AutoPiP"
+    placeholder: "e.g. 2.0.0"
+  validations:
+    required: true
+- type: textarea
+  id: additional
+  attributes:
+    label: Additional Context
+    description: Screenshots, screen recordings, or anything else that might help.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: "✨ Feature Request"
+description: Suggest an idea or improvement
+labels: [ "enhancement" ]
+body:
+- type: textarea
+  id: description
+  attributes:
+    label: Description
+    description: What would you like to see added or changed?
+  validations:
+    required: true
+- type: textarea
+  id: use-case
+  attributes:
+    label: Use Case
+    description: Why is this feature useful? What problem does it solve?
+  validations:
+    required: true
+- type: textarea
+  id: alternatives
+  attributes:
+    label: Alternatives Considered
+    description: Have you considered any workarounds or alternative approaches?

.github/pull_request_template.md

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+## Description
+
+<!-- Briefly describe the changes in this PR -->
+
+## Type of Change
+
+- [ ] 🐛 Bug fix
+- [ ] ✨ New feature
+- [ ] 🔧 Refactoring
+- [ ] 📝 Documentation
+- [ ] 🏗️ CI/CD
+- [ ] 🔒 Security
+
+## Checklist
+
+- [ ] I have tested my changes locally
+- [ ] I have updated `semver.txt` (if this change affects the released version)
+- [ ] My changes do not introduce new warnings or errors
+- [ ] I have updated documentation where necessary
+
+## Related Issues
+
+<!-- Fixes #123, Relates to #456 -->