chore(logging): demote every logger.info to debug

[PastaPastaPasta]

Summary

• Every logger.info call in app/, components/, hooks/, lib/ and contexts/ becomes logger.debug. There were 240 across 38 files; all of them were tracing (queries issued, documents found, retry attempts, key matches, sync progress), none was an operator-facing event.
• The logger's production minimum level is info, so until now every one of these printed to the user's browser console. Development builds (min level debug) still show them; NEXT_PUBLIC_LOG_LEVEL=debug shows them anywhere.
• lib/logger.ts now documents what each level is for so the next call lands at the right one. warn and error are untouched.

Mechanical: one sed-style replace, no argument or message changes. Nothing in e2e/ or the unit specs asserts on log output.

Part of the anti-slop cleanup series (after #370–#386).

Test plan

• npm run lint (zero warnings), tsc --noEmit, npm run test, npx knip, npm run build all green locally
• CI
• Manual: production build console is quiet on the feed; NEXT_PUBLIC_LOG_LEVEL=debug brings the tracing back

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