chore: Add HTTP/2 workaround and improve API reliability

Disable HTTP/2 to prevent connection hangs, reduce default timeout
to 30s, and add periodic device cache refresh. Implement rollback
on SetTemperature failures and verify temperature changes. Extract
ParseTemperature for reuse and add token invalidation on 401
responses with automatic re-authentication.

chore: Add retry logic with exponential backoff to HTTP requests

Implements exponential backoff with jitter for transient failures
like network errors, rate limits (429), and server errors (5xx).
Client errors (4xx except 429) are treated as permanent and fail
immediately without retry. Configurable retry attempts (5) and
intervals (500ms to 30s).

Update .goreleaser.yaml

Reuse Eight Sleep client across daemon lifetime

Previously a new client was created and started for each action
execution and state sync check. This was inefficient and could
cause connection issues. Now a single client is created at daemon
startup and reused for all operations throughout its lifetime.

Fix overnight schedule handling and export temp conversion

- Check yesterday's schedule to handle overnight schedules correctly
- Export TempToHeatingLevel function and remove duplicate code
- Replace abs() helper with inline calculation
- Improve documentation for overnight schedule logic

Add configurable sync interval for device state checks

feat: new --sync-interval flag to control how often the daemon checks and syncs device state, reducing unnecessary API calls. The sync now runs on a separate ticker, and the default interval is set to 5 minutes. Also removes redundant state sync from the main schedule processing loop.

feat: add state synchronization when in deamon mode

feat: add `daemon` mode

chore: add ability to quiet the config file path message

chore: unhide `status` cmd