* fix(sync): add backend name prefix to all OAuth log messages (#121)
Problem: four log messages in `oauth.lua` lacked the `self.name` backend
prefix, producing generic notifications instead of identifying which
backend (`gcal`/`gtasks`) triggered the message.
Solution: prepend `self.name .. ': '` to the four unprefixed messages
and drop the hardcoded "Google" from the browser prompt since `self.name`
already identifies the service.
* fix(sync): canonicalize all log prefixes across sync backends (#121)
Problem: log messages in `oauth.lua`, `gcal.lua`, `gtasks.lua`, and
`s3.lua` were inconsistent — some lacked a backend prefix, others used
sentence-case or bare error strings without identifying the source.
Solution: prefix all user-facing log messages with their backend name
(`gcal:`, `gtasks:`, `S3:`, `Google:`). Capitalize `S3` and `Google`
display names. Normalize casing and separator style (em dash) across
all sync log sites.
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