Adding time interval blocking

[julienbovet]

Hello there!

This is a PR to add time-interval blocking features to block site.

[julienbovet]

Summary

Adds support for multiple time ranges and complex blocking schedules, enabling users to:

Specify multiple time ranges per entry (e.g., block morning and afternoon with lunch break)
Define different schedules for different days (e.g., weekday hours vs. weekend hours)
Create complex blocking patterns with multiple day-time combinations
New Syntax Examples

Multiple time ranges (no lunch blocking)

example.com 9:00-12:00 14:00-17:00

Multiple times on specific days

facebook.com Mon-Fri 9:00-12:00 14:00-17:00

Different schedules for different days

youtube.com Mon-Fri 9:00-17:00 Sat 10:00-14:00

Complex: weekdays (morning+afternoon) + Saturday (morning only)

reddit.com Mon-Fri 9:00-12:00 14:00-18:00 Sat 10:00-12:00
Implementation Details
Data structure: Changed from single objects to arrays (schedule → schedules[], timeRange → timeRanges[])
Parser: Smart lookahead algorithm that groups schedules by day patterns
Validation: OR semantics - blocks if ANY schedule matches and ANY time range within that schedule matches
Backward compatibility: Fully maintained - all existing single time range formats still work
Test Coverage
76 tests passing (67 original + 9 new)
All backward compatibility tests pass
New tests cover:
Multiple time ranges without days
Multiple time ranges with days
Multiple schedules with different days
Complex combinations
Edge cases (time before day pattern, multiple day patterns, etc.)
Build Status
✅ Build successful for both Chrome and Firefox

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