fix: enforce disabled state across Tabs, TabBar, Tab and TabBarView

[ndonkoHenri]

Fix #6220

Summary by Sourcery

Enforce disabled state behavior across Tabs, TabBar, Tab, and TabBarView and add coverage for these scenarios.

Bug Fixes:

• Prevent disabled tabs and tab bars from changing selection or emitting click/hover events.
• Disable swiping between views when TabBarView is disabled by its parent Tabs control.

Tests:

• Add integration tests verifying disabled behavior for individual tabs, the entire TabBar, and the Tabs container.
• Adjust tabs integration test setup to create a fresh Flet app per test function for isolation.

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Pull request overview

This PR fixes a regression bug (#6220) where disabling tab buttons in Flet 0.80.*/0.81.0 did not work as expected. The fix enforces the disabled state across the entire Tabs component hierarchy (Tabs, TabBar, Tab, and TabBarView).

Changes:

• Added comprehensive disabled state handling in Dart implementation for TabBar, individual Tabs, and TabBarView
• Added three new integration tests to verify disabled state behavior at different levels
• Updated existing tests to use function-scoped fixtures for better test isolation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
sdk/python/packages/flet/integration_tests/controls/material/test_tabs.py	Added function-scoped fixture override and three comprehensive tests for disabled state (individual tab, TabBar, and Tabs control)
packages/flet/lib/src/controls/tabs.dart	Implemented disabled state enforcement: TabBarView prevents scrolling, TabBar uses IgnorePointer wrapper, and onTap/onHover handlers check individual tab disabled states

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