Enhance timer UI/logic, sleep handling, and container health checks

[cto-new]

What was changed

• Updated timer scheduling behavior for sleep mode:
  • Scheduled executions now check sleep mode at trigger time.
  • If sleep mode is active, the webhook is not fired, a log entry is recorded with Skipped: sleep mode active, and the timer continues to the next interval.
• Increased retained per-entry execution history from 10 to 15 entries.
• Added server time API endpoint (GET /api/time) and wired timezone handling (time.Local = TZ) so UI can display system time.
• Added binary healthcheck command (/webhooktimer healthcheck) and Docker health checks:
  • Dockerfile now includes a HEALTHCHECK instruction.
  • docker-compose.yml now includes a matching healthcheck block.

UI updates

• Reworked the State control to a toggle switch style (instead of checkbox appearance), including state toggles in the entries table.
• Removed the extra visible enabled label next to state controls in the entries list.
• Fixed random interval input layout so fields no longer overflow the form panel.
• Added hour/minute/second duration inputs for:
  • Fixed interval
  • Random min
  • Random max
    (converted to total seconds for API payload compatibility)
• Updated “Next run” countdown behavior:
  • Removed due... display.
  • Countdown refresh now runs every 0.5 seconds.
• Updated UI polling behavior:
  • Entry refresh checks run every 0.5 seconds only while the tab is visible.
• Added a live system time display (hh:mm:ss) with timezone label in the UI header.
• Improved log display styling for skipped sleep-mode executions (warning style).

Documentation

• Updated README.md content to reflect current functionality (JSON persistence, 0.5s live updates, 15 log entries, sleep skip behavior, health checks) while preserving the original structure/section layout.

Notes

• Frontend behavior was validated in-browser with agent-browser against the running app.
• Sleep mode skip behavior and healthcheck status were additionally validated via API and Docker Compose (healthy state observed).

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