v0.3.4-rc5 — Final pre-PR test

Pre-release RC5 — final test before PR

1. Dataview API load-order fix — deferred getAPI() to onload, listens for dataview:api-ready
2. Null link guard — graph links with null source/target don't crash renderer
3. No-renderer guard — don't render when no graph view is open
4. Removed dead getAPI import from linkManager.ts
5. waitForRenderer() times out after 10s instead of polling forever
6. package-lock.json synced to match package.json version

Install: Download main.js, manifest.json, styles.css → .obsidian/plugins/graph-link-types/