Prepare v0.4 release and open source docs

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a reproducible problem in I Hate PDFs
+title: ""
+labels: bug
+assignees: ""
+---
+
+## Summary
+
+What happened?
+
+## Expected Behavior
+
+What did you expect to happen?
+
+## Steps To Reproduce
+
+1.
+2.
+3.
+
+## Environment
+
+- I Hate PDFs version/build:
+- macOS version:
+- Install source: GitHub release or Mac App Store
+- Mac architecture: Apple Silicon or Intel
+
+## Screenshots Or Recordings
+
+Attach screenshots or recordings for UI problems. Each file must be under 1 MB.
+
+## Additional Context
+
+Add any relevant PDF workflow details. Do not attach private PDFs publicly.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an improvement for I Hate PDFs
+title: ""
+labels: enhancement
+assignees: ""
+---
+
+## Problem
+
+What workflow problem should this solve?
+
+## Proposed Solution
+
+What should I Hate PDFs do?
+
+## Alternatives Considered
+
+What workaround or other app behavior have you tried?
+
+## UI Impact
+
+Will this change visible UI? If yes, describe the screen, toolbar, menu, sidebar, popover, or dialog affected.
+
+## Size And Privacy Impact
+
+Does this require new assets, dependencies, network behavior, bundled PDFs, or release-size increases?