feat: MCP-led listing - network icon + new store description (0.2.1)

[vreshch]

Listing optimization from the competitive-analysis workflow (goal: more installs).

• Ribbon icon → network (distinct from the refresh-cw Sync now action); a central node radiating to endpoints reads as "one memory, every AI".
• Store description (manifest) rewritten to lead with the named AI clients + MCP + Obsidian (the in-app Browse search indexes name+author+description only): "Let Claude, ChatGPT, Cursor, and any MCP client read and write your Obsidian vault. Two-way Git sync to a private memory, safe merges with flagged conflicts, plain Markdown you own. Up to 100 MB included." (204 chars)
• README intro → pain-first hook ("Stop copying notes into every chatbot…").
• Storage stated plainly (100 MB included) - not highlighted as "free".
• CHANGELOG 0.2.1.

npm run verify green. Bumps 0.2.0 → 0.2.1.

[github-actions]

🎉 PR Validation ✅ PASSED

Commit: e73b551144ffc5a480d9fa87fa44593ea9fc83c6
Branch: feature/listing

Checks:

• ✅ Dependencies installed
• ✅ Type check passed
• ✅ Linting passed
• ✅ Format check passed
• ✅ Tests + coverage passed
• ✅ Build successful
• ✅ Store-compliance checks passed
• ✅ Bundle is mobile-safe

Ready to merge! ✨

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