Refactor: Replace deprecated Flutter APIs for compatibility with newer versions

[akhil-ge0rge]

This PR updates the codebase to remove usage of deprecated Flutter APIs.

Changes include:

• Migrating deprecated properties to their recommended replacements
• Ensuring compatibility with the latest Flutter stable release
• Improving code maintainability and future-proofing

All changes are backward-compatible and do not alter UI or functionality.

[Copilot]

Pull request overview

This PR modernizes the Flutter codebase by replacing deprecated APIs with their current recommended equivalents, ensuring compatibility with newer Flutter versions while maintaining all existing functionality.

Key changes:

• Replaced withOpacity() with withValues(alpha:) for color opacity modifications
• Updated color component accessors from .red/.green/.blue/.opacity to .r/.g/.b/.a
• Migrated textScaleFactor and textScaleFactorOf to the newer TextScaler API
• Changed mounted property checks to context.mounted for better context safety
• Refactored forEach to standard for loops where appropriate

Reviewed changes

Copilot reviewed 37 out of 37 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
petra_illustration.dart	Updated opacity method calls on foreground colors
illustration_piece.dart	Code formatting adjustments
_wonder_image_with_timeline.dart	Migrated color component accessors to new API
_events_list.dart	Updated backdrop color opacity usage
_event_markers.dart	Replaced opacity method calls for marker colors
_animated_cutout_overlay.dart	Updated overlay color opacity
intro_screen.dart	Migrated gradient color opacity
home_menu.dart	Updated mounted check and multiple color opacity calls
about_dialog_content.dart	Migrated text scale factor to TextScaler API
wonders_home_screen.dart	Updated multiple gradient and color opacity calls
_scrolling_content.dart	Migrated text scale factor and updated color opacity
_collapsing_pull_quote_image.dart	Updated gradient color opacity values
_app_bar.dart	Updated overlay color opacity
_collection_footer.dart	Updated footer gradient and progress bar colors
_collectible_image.dart	Updated shadow color opacity
_celebration_particles.dart	Updated particle color opacity
collectible_found_screen.dart	Updated multiple screen color opacity calls
_search_input.dart	Updated input decoration color opacity values
_results_grid.dart	Updated result tile background opacity
_result_tile.dart	Updated tile color opacity
time_range_painter.dart	Updated paint fill color opacity
range_selector.dart	Updated selector decoration color opacity values
expanding_time_range_selector.dart	Updated container and timeline colors
artifact_search_screen.dart	Updated icon color opacity
_artifact_image_btn.dart	Updated gradient color opacity
_blurred_image_bg.dart	Updated background foreground decoration opacity
artifact_carousel_screen.dart	Updated carousel container color opacity
static_text_scale.dart	Migrated textScaleFactor to TextScaler API
list_gradient.dart	Updated gradient color opacity values
fade_color_transition.dart	Updated transition color opacity
scroll_decorator.dart	Updated scroll gradient color opacity
checkbox.dart	Updated checkbox color opacity values
app_image.dart	Updated placeholder icon color opacity
app_backdrop.dart	Updated backdrop fill color opacity
styles.dart	Updated shadow color opacity values
color_utils.dart	Migrated color component accessors to new API
app_logic.dart	Refactored forEach to for loops

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