feat: add update check functionality and improve menu options for macOS

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a reproducible problem
+title: "bug: "
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug.
+
+        Please include description/screenshots if possible.
+
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: What did you expect, what happened instead?
+      placeholder: Steps + expected vs actual
+    validations:
+      required: true
+
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to reproduce
+      description: Numbered steps help a lot
+      placeholder: |
+        1.
+        2.
+        3.
+    validations:
+      required: true
+
+  - type: dropdown
+    id: runtime
+    attributes:
+      label: Runtime
+      multiple: true
+      options:
+        - Desktop MacOS app
+        - Mobile (Web/PWA)
+        - Desktop Web
+        - VS Code extension
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: OpenChamber version
+      placeholder: "e.g. 1.2.3"
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / screenshots
+      description: Paste relevant logs or attach screenshots
+      render: shell

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: GitHub Discussions
+    url: https://github.com/btriapitsyn/openchamber/discussions
+    about: Ask questions and share ideas

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an improvement or new capability
+title: "feat: "
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for proposing an idea.
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem / use case
+      description: What are you trying to do?
+      placeholder: "As a user, I want..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: What would you like to see happen?
+      placeholder: UI, behavior, config, etc.
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      placeholder: "Other approaches you've tried/considered"
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Links, screenshots, mockups, etc.