fixed out of range focusDay bug in calendar

[DeveloperAmrit]

Closes #132

📝 Description

Hardcoded date range in calendar was causing errors when current date was going out of that range, fixed it by dynamically setting range relative to current date.

🔧 Changes Made

• Removed hardcoded range
• Used dynamic range setting, 10 years from the current date of user.

• Fixed a bug in calendar page which was causing error when current date was going out of range of hardcoded date.

📷 Screenshots or Visual Changes (if applicable)

🤝 Collaboration

Collaborated with: @username (optional)

✅ Checklist

• [y ] I have read the contributing guidelines.
• [ y] I have added tests that prove my fix is effective or that my feature works.
• [y ] I have added necessary documentation (if applicable).
• [y ] Any dependent changes have been merged and published in downstream modules.

Summary by CodeRabbit

• New Features
  • Calendar date range expanded to support ±100 years from the current year, replacing the previous fixed window.
  • Calendar navigation now properly tracks the currently visible month when scrolling through dates.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The calendar's date range has been changed from a fixed period (2024-01-01 to 2025-12-31) to a dynamic 100-year window centered on the current year. An onPageChanged callback was added to update the focused day when the visible calendar page changes.

Changes

Cohort / File(s)	Summary
Calendar Date Range Expansion lib/screens/calendar/calendar_screen.dart	Changed firstDay and lastDay from hardcoded values to dynamic calculation based on current year (±100 years). Added onPageChanged callback to TableCalendar to synchronize _focusedDay with user navigation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

📅 A calendar once crashed with time out of place,
But now it expands with a century's grace,
One hundred years forward, one hundred back,
Dynamic and nimble, no more does it lack!
When pages turn gently, the focus updates right,
The calendar hops—no more crashes in sight! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly addresses the bug fix for the out-of-range focusDay crash issue mentioned in #132, clearly summarizing the main change.
Linked Issues check	✅ Passed	The implementation addresses both key requirements from #132: dynamic date ranges (100-year window centered on current year) and onPageChanged callback to update focusedDay.
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing the TableCalendar crash issue; no unrelated modifications were introduced.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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