feat: add optional sleep time feature to webhooktimer

[cto-new]

Summary

Added optional sleep time feature to webhooktimer - a time period during which webhooks won't be triggered even if timer expires.

Changes Made

Backend (Go)

1. internal/models/timer.go: Added two new fields to TimerEntry struct:

   • SleepTimeStart - Start time in HH:MM format (24-hour)
   • SleepTimeEnd - End time in HH:MM format (24-hour)

2. internal/models/db.go: Updated SQLite schema to include:

   • sleep_time_start TEXT column
   • sleep_time_end TEXT column

3. internal/timer/manager.go:

   • Added isSleepTime() helper that checks if current time falls within sleep window
   • Added parseTime() helper to parse HH:MM strings
   • Modified runTimer() to skip webhook execution during sleep time
   • Handles sleep times that span midnight (e.g., 23:00-06:00)
   • Uses Europe/Berlin timezone for time calculations

4. internal/handlers/handlers.go:

   • Updated CreateTimer, UpdateTimer, and ToggleTimer handlers to include sleep time fields in SQL queries

Frontend (HTML/JavaScript)

5. web/templates/index.html:
   • Added "Enable Sleep Time" checkbox with toggle switch styling
   • Added sleep time input fields (Start/End in HH:MM format) with time picker
   • Updated editTimer() to populate sleep time fields when editing
   • Updated form submission to include sleep time data
   • Updated new-timer-btn handler to reset sleep time fields

Usage

1. Create or edit a timer
2. Check "Enable Sleep Time"
3. Set the start and end times (e.g., 23:00 to 06:00 for overnight sleep)
4. During the configured time window, webhooks will not be triggered even if the timer expires
5. The timer continues to run and will execute webhooks once the sleep window ends

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