fix: Improve Tabdisplay

[ndonkoHenri]

Fix #5599

Summary by Sourcery

Improve tab rendering and per-control theming by centralizing control context handling and aligning Tabs with Flutter's Tab heuristics.

New Features:

• Add a reusable control context wrapper that combines control reactivity and per-control theming for all controls.
• Expose a Control extension method to build widgets within the standardized control context.

Bug Fixes:

• Fix inconsistent Tab display by ensuring TabBar sees tab widgets as Tab instances and by aligning icon/text hints and sizing behavior.

Enhancements:

• Refactor ControlWidget to use the new control context helper, simplifying widget construction and theme application.
• Introduce a TabControl that extends Flutter's Tab to provide better integration with TabBar sizing and icon/label heuristics while still using Flet controls for content.
• Ensure TabBar tabs created from arbitrary controls are wrapped in Tab widgets for consistent hover and splash behavior.
• Add per-control theme resolution that respects theme, dark_theme, and theme_mode properties, falling back to the parent theme and system brightness as appropriate.

[sourcery-ai]

We've reviewed this pull request using the Sourcery rules engine

[Copilot]

Pull request overview

This PR refactors the Tab control rendering to better integrate with Flutter's TabBar widget while extracting reusable control context and theme utilities.

Key Changes:

• Extracted control context/theme logic from ControlWidget into reusable withControlNotifier, withControlContext, and withControlTheme functions
• Modified TabControl to extend Tab and provide size hints to Flutter's TabBar while building custom content
• Enhanced tab building in TabBarControl to explicitly handle Tab-type controls vs. arbitrary controls

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/flet/lib/src/widgets/control_inherited_notifier.dart	Added reusable utility functions for wrapping widgets with ControlInheritedNotifier and per-control theme support; includes extension method for convenient access
packages/flet/lib/src/controls/tabs.dart	Refactored TabControl to extend Tab for proper TabBar integration; improved tab building logic to set notifyParent and handle non-Tab controls
packages/flet/lib/src/controls/control_widget.dart	Simplified by delegating to new control context utilities; removed duplicate theme/notifier wrapping logic

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