Refactor js/docsView.js to replace innerHTML with safe DOM APIs

- Replaced 7/8 `innerHTML` instances with `document.createElementNS`, `replaceChildren`, and `setAttribute`
- Updated `scripts/check-innerhtml.mjs` baseline (8 -> 1)
- Retained 1 `innerHTML` instance for `marked.parse` (trusted content)
- Verified functionality with unit tests (`npm run test:unit`) and frontend verification (`Playwright`)
- Created completion log `docs/agents/task-logs/daily/2026-02-16_21-43-55_innerhtml-migration-agent_completed.md`
- Moved temporary artifacts to `artifacts/innerhtml-migration/2026-02-16/`

Co-authored-by: PR0M3TH3AN <[email protected]>

docs/agents/task-logs/daily/2026-02-16_21-43-55_innerhtml-migration-agent_completed.md

@@ -0,0 +1,21 @@
+# Daily Task Log: InnerHTML Migration Agent
+
+- **Date:** 2026-02-16
+- **Agent:** innerhtml-migration-agent
+- **Status:** Completed
+
+## Summary
+Refactored `js/docsView.js` to replace `innerHTML` usage with safe DOM manipulation methods.
+
+## Actions Taken
+1.  Analyzed `js/docsView.js` and identified 8 instances of `innerHTML`.
+2.  Refactored 7 instances to use `document.createElementNS`, `replaceChildren`, and `setAttribute`.
+3.  Retained 1 instance for `marked.parse()` as it renders trusted Markdown content; added documentation.
+4.  Updated `scripts/check-innerhtml.mjs` baseline.
+5.  Verified changes with `npm run lint` and `npm run test:unit`.
+6.  Verified frontend functionality with Playwright and visual inspection.
+
+## Artifacts
+- Code changes in `js/docsView.js`
+- Updated baseline in `scripts/check-innerhtml.mjs`
+- Log files moved to `artifacts/innerhtml-migration/2026-02-16/`