fix(riv-f41c): exclude OAuth and .well-known routes from service worker caching

Feat: Add avatar and banner upload UI to profile editor

UI: Add inline image upload button to Tiptap bubble menu

Fix inferOriginalContent to treat link-only and short-text links as not original

Refactor PostComposer into smaller specialized components

Implement transactionality and retries for dual-write posts

Commit gemini-recommendations before merge

Implement quote posts, reactive time, and post deletion