fix: replace deprecated withOpacity() with withValues() and clean up unused variables in calendar_screen.dart

[Satyanarayana001]

Fixes #234

Problem

flutter analyze reported multiple issues in calendar_screen.dart:

• deprecated withOpacity() calls (precision loss)
• unnecessary string interpolation (line 487)
• unused local variable 'results' (line 186)
• unused local variable 'selectedDateTime' (line 699)

Fix

• Replaced .withOpacity(x) with .withValues(alpha: x)
• Removed unnecessary string interpolation
• Removed unused local variables 'results' and 'selectedDateTime'

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Reviewing files that changed from the base of the PR and between 5afe656 and 2c524f8.

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• lib/screens/calendar/calendar_screen.dart

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[Satyanarayana001]

Hi 👋, just a gentle follow-up on this PR.

This PR addresses multiple issues reported by flutter analyze in calendar_screen.dart, including deprecated API usage and unused variables.

Please let me know if any changes are needed. Thanks!