Add: windows mvp - transparent bugs not fixed

docs/QA_EVIDENCE_TEMPLATE.md

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+# QA Evidence Template
+
+Use this block inside `issues/issueN.md` under `## Verification`.
+
+```md
+### Commands Run
+
+- [ ] `cargo check --workspace`
+- [ ] `cargo test --workspace`
+- [ ] `just qa-validate`
+
+### Command Output Summary
+
+- `cargo check --workspace`: pass/fail, key notes
+- `cargo test --workspace`: pass/fail, key notes
+- `just qa-validate`: pass/fail, key notes
+
+### Screenshots
+
+- Before:
+  - `issues/screenshots/issueN-before-YYYYMMDD-HHMMSS.png`
+- After:
+  - `issues/screenshots/issueN-after-YYYYMMDD-HHMMSS.png`
+
+### Visual Assertions
+
+- [ ] Overlay is transparent where expected
+- [ ] Window size/placement behavior matches expected result
+- [ ] Sprite/background alpha behavior matches expected result
+
+### Reviewer Record
+
+- Date:
+- Verified by:
+- Final result:
+- Notes:
+```
+