Prepare v0.4 release and open source docs

.github/CODEOWNERS

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+* @akkolli

.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?

.github/pull_request_template.md

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+## Summary
+
+Describe what changed and why.
+
+## Screenshots Or Recordings
+
+Required for UI changes. Include before and after screenshots for changed UI, or at least one screenshot/recording for new UI.
+
+Each screenshot, recording, and committed media file included with this pull request must be under 1 MB.
+
+## Checks
+
+List the checks you ran:
+
+- [ ] `swift test`
+- [ ] `swift build -c release`
+- [ ] `scripts/verify-release-artifacts.sh`
+- [ ] Manual UI check
+- [ ] Not run, because:
+
+## Checklist
+
+- [ ] I read `CONTRIBUTING.md`.
+- [ ] This pull request is focused on one behavior, fix, or documentation change.
+- [ ] I updated `CHANGELOG.md` for user-visible changes, or this change is not user-visible.
+- [ ] UI changes include screenshots or recordings, or this pull request does not change UI.
+- [ ] Every screenshot, recording, and committed media file in this pull request is under 1 MB.
+- [ ] I explained any app-size impact from new assets, dependencies, or release packaging changes.

.github/workflows/media-size.yml

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+name: Media Size
+
+on:
+  pull_request:
+    paths:
+      - "**/*.gif"
+      - "**/*.jpeg"
+      - "**/*.jpg"
+      - "**/*.mov"
+      - "**/*.mp4"
+      - "**/*.png"
+      - "**/*.webp"
+
+jobs:
+  media-size:
+    name: Media files under 1 MB
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check changed media size
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          limit_bytes=1048576
+          failed=0
+
+          mapfile -t media_files < <(
+            git diff --name-only --diff-filter=ACMRT \
+              "${{ github.event.pull_request.base.sha }}" \
+              "${{ github.event.pull_request.head.sha }}" \
+              -- \
+              '*.gif' '*.jpeg' '*.jpg' '*.mov' '*.mp4' '*.png' '*.webp'
+          )
+
+          for file in "${media_files[@]}"; do
+            if [[ ! -f "$file" ]]; then
+              continue
+            fi
+
+            size_bytes=$(wc -c < "$file" | tr -d ' ')
+            if (( size_bytes >= limit_bytes )); then
+              echo "::error file=${file}::Media file is ${size_bytes} bytes. Keep each screenshot, recording, and committed media file under 1 MB."
+              failed=1
+            fi
+          done
+
+          exit "$failed"