chore: add GitHub issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Something isn't working as expected
+labels: ["bug"]
+assignees: [kristoferssolo]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Before submitting, check [existing issues](../../issues) to avoid duplicates.
+  - type: input
+    id: typst-version
+    attributes:
+      label: Typst Version
+      description: Run `typst --version`
+      placeholder: "e.g. typst 0.14.0"
+    validations:
+      required: true
+  - type: input
+    id: template-version
+    attributes:
+      label: Template Version
+      description: Release tag or commit hash
+      placeholder: "e.g. v1.0.0 or a3f5c2d"
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Clear and concise description of the bug.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Minimal Reproduction
+      description: >
+        A minimal `.typ` snippet that reproduces the issue. Remove everything not necessary to trigger the bug.
+
+      render: typst
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+    validations:
+      required: true
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: >
+        Screenshots, PDF output snippets, compiler errors, or anything else relevant.
+
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/documentation.yml

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+name: Documentation
+description: Missing, incorrect, or unclear documentation
+labels: ["documentation"]
+assignees: [kristoferssolo]
+body:
+  - type: input
+    id: location
+    attributes:
+      label: Location
+      description: File, section, or page where the issue is.
+      placeholder: "e.g. README.md > Usage, or docs/structure.md"
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: What's Wrong
+      description: What is missing, incorrect, or unclear?
+    validations:
+      required: true
+  - type: textarea
+    id: suggestion
+    attributes:
+      label: Suggested Improvement
+      description: How should it read or what should be added?
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest new functionality or an enhancement
+labels: ["feature"]
+assignees: [kristoferssolo]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Before submitting, check [existing issues](../../issues) to avoid duplicates.
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem / Motivation
+      description: What problem does this solve? Why is it needed?
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the feature and how it should work.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Any workarounds or other approaches you've considered.
+    validations:
+      required: false
+  - type: checkboxes
+    id: lu-scope
+    attributes:
+      label: Scope
+      options:
+        - label: >
+            This is required or implied by University of Latvia thesis guidelines
+
+        - label: This is a general usability or quality-of-life improvement

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: Ask a question about using the template
+labels: ["question"]
+assignees: [kristoferssolo]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Check the [README](../../blob/main/README.md) and
+        [existing issues](../../issues) first.
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      description: >
+        What are you trying to achieve? What have you already tried?
+
+    validations:
+      required: false
+  - type: input
+    id: typst-version
+    attributes:
+      label: Typst Version
+      description: If relevant, run `typst --version`
+      placeholder: "e.g. typst 0.14.0"
+    validations:
+      required: false