fix: switch issue templates to YAML forms, remove broken markdown templates

Markdown-based issue templates with frontmatter were silently ignored
by GitHub (likely an empty-string assignees field or frontmatter
format issue). Switched to the newer YAML-based issue forms which use
a structured schema format that GitHub explicitly supports.

- bug_report.yml: structured form with required fields for description,
  reproduction steps, environment, screenshots
- feature_request.yml: form with problem/motivation, proposed solution,
  alternatives, mockups
- config.yml: unchanged, keeps blank_issues_enabled: false

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,41 +0,0 @@
----
-name: 🐛 Bug report
-description: Report a bug or unexpected behaviour
-title: '[bug] '
-labels: bug
----
-
-## Describe the bug
-
-<!-- A clear and concise description of what the bug is. -->
-
-## To reproduce
-
-Steps to reproduce the behaviour:
-
-1. Go to '…'
-2. Tap on '…'
-3. Scroll to '…'
-4. See error
-
-## Expected behaviour
-
-<!-- What should have happened instead? -->
-
-## Screenshots / screen recordings
-
-<!-- If applicable, add screenshots or a screen recording to help explain the problem. -->
-
-## Environment
-
-- Device: <!-- e.g. Pixel 8, Samsung Galaxy S24 -->
-- Android version: <!-- e.g. Android 14, Android 15 -->
-- App version: <!-- e.g. v1.2.3, or the commit SHA -->
-- Hermes dashboard version: <!-- if known -->
-
-## Additional context
-
-<!--
-  Anything else? Error logs, crash reports (adb logcat), network trace, etc.
-  Remove any sensitive info (tokens, hostnames) before pasting.
--->

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,53 @@
+name: 🐛 Bug report
+description: Report a bug or unexpected behaviour
+title: '[bug] '
+labels: ['bug']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug! Please fill in the details below.
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+      placeholder: What happened? What did you expect to happen?
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: To reproduce
+      description: Steps to reproduce the behaviour.
+      placeholder: |
+        1. Go to '...'
+        2. Tap on '...'
+        3. Scroll to '...'
+        4. See error
+    validations:
+      required: true
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots / screen recordings
+      description: If applicable, add screenshots or a screen recording to help explain the problem.
+      placeholder: Drag & drop images here
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Device, OS version, app version, and Hermes dashboard version.
+      placeholder: |
+        - Device: e.g. Pixel 8, Samsung Galaxy S24
+        - Android version: e.g. Android 14, Android 15
+        - App version: e.g. v1.2.3, or the commit SHA
+        - Hermes dashboard version: if known
+    validations:
+      required: true
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Error logs, crash reports, adb logcat output, or anything else relevant.
+      placeholder: Remove any sensitive info (tokens, hostnames) before pasting.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,32 +0,0 @@
----
-name: ✨ Feature request
-description: Suggest an idea, enhancement, UX improvement, or refactor
-title: '[enhancement] '
-labels: enhancement
----
-
-## Problem / motivation
-
-<!--
-  What problem would this solve? Why is this needed?
-  e.g. "It's frustrating when …" or "The app currently lacks …"
--->
-
-## Proposed solution
-
-<!-- A clear description of what you want to happen. -->
-
-## Alternative approaches
-
-<!-- Any alternative solutions or features you've considered. -->
-
-## Screenshots / mockups
-
-<!-- If applicable, add sketches, screenshots from other apps, or wireframes. -->
-
-## Additional context
-
-<!--
-  Any other details: links to similar features in other apps, relevant issues,
-  API endpoints that would be consumed, etc.
--->

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,43 @@
+name: ✨ Feature request
+description: Suggest an idea, enhancement, UX improvement, or refactor
+title: '[enhancement] '
+labels: ['enhancement']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for your suggestion! Please describe the feature or improvement you'd like to see.
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem / motivation
+      description: What problem would this solve? Why is this needed?
+      placeholder: |
+        e.g. It's frustrating when ... or The app currently lacks ...
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+      description: A clear description of what you want to happen.
+      placeholder: Describe your ideal solution here.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternative approaches
+      description: Any alternative solutions or features you've considered.
+      placeholder: What else could work?
+  - type: textarea
+    id: mockups
+    attributes:
+      label: Screenshots / mockups
+      description: Sketches, screenshots from other apps, or wireframes.
+      placeholder: Drag & drop images here
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Any other details, links, or relevant API endpoints.