[security] replace innerHTML usages in js/ui/components/ShareNostrModal.js — convert to safe DOM APIs

- Replace template `innerHTML` with `DOMParser`
- Replace SVG `innerHTML` with `createElementNS`
- Replace `innerHTML = ""` with `replaceChildren()`
- Update `check-innerhtml` baseline

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

docs/agents/task-logs/daily/2026-02-20_innerhtml-migration-agent_completed.md

@@ -0,0 +1,24 @@
+# innerHTML Migration Task: ShareNostrModal.js
+
+**Date:** 2026-02-20
+**Agent:** innerhtml-migration-agent
+**Status:** Completed
+
+## Migrated File
+* `js/ui/components/ShareNostrModal.js` (3 innerHTML assignments migrated)
+
+## Changes
+1.  **Template Loading:** Replaced `wrapper.innerHTML = html` with `DOMParser` logic.
+2.  **Clearing Content:** Replaced `this.relayPills.innerHTML = ""` with `replaceChildren()`.
+3.  **SVG Icon:** Replaced `removeButton.innerHTML = SVG` with `createElementNS`.
+
+## Verification
+* `npm run lint` passed.
+* `npm run test:unit` passed.
+* `node scripts/check-innerhtml.mjs --report` confirmed count reduction (3 -> 0 for this file).
+* `scripts/check-innerhtml.mjs` baseline updated.
+
+## Artifacts
+* `context/CONTEXT_2026-02-20_innerhtml.md`
+* `todo/TODO_2026-02-20_innerhtml.md`
+* `decisions/DECISIONS_2026-02-20_innerhtml.md`