Connect linkblogs to existing publications

[disnet]

Summary

• Connect linkblogs to existing user-owned standard.site publications with per-format content.
• Keep externally managed publication records read-only while routing new shares correctly.
• Migrate follower scopes across every publication transition and preserve the earliest pending graph edge through rapid switches.
• Resolve connected publications on public linkblog pages and expose the settings picker.

Checks

• backend: focused linkblog tests pass (22/22); type and formatting checks pass.
• frontend: Svelte/type/format checks pass (0 errors; 25 existing warnings).
• linkblog-site: Svelte/type/format checks pass (0 errors, 0 warnings).
• Full backend test run attempted; runner killed it while starting the complete isolated Worker suite.

Radial artifact