fix: Escape button via deleting useless macOS specific WindowTitleBarBox

[XMLHexagram]

close #118

After reading the code and during experiments, I believe the deleted macOS specific WindowTitleBarBox is legacy and is the cause of #118. Therefore, I removed it to solve that issue.

Summary by Sourcery

Bug Fixes:

• Remove the macOS specific WindowTitleBarBox to fix the issue causing the Escape button malfunction.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR removes a macOS-specific WindowTitleBarBox widget that was causing issues with the escape button functionality (issue #118). The implementation simply deletes the unnecessary code block that was wrapping a Container widget with a fixed width of 28 pixels.

Class diagram for NavigationBarState changes

classDiagram
    class NavigationBarState {
        - WindowTitleBarBox (macOS specific)
    }
    note for NavigationBarState "Removed macOS specific WindowTitleBarBox widget"

Loading

File-Level Changes

Change	Details	Files
Remove legacy macOS-specific window title bar box	Delete conditional rendering of WindowTitleBarBox widget Remove container with fixed width of 28 pixels	lib/widgets/navigation_bar/navigation_bar.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#118	Fix the incorrectly positioned escape/close button in the search interface on macOS	✅

Possibly linked issues

• macOS: Escape from search button misses in search  #118: The PR removes a legacy component causing the escape button issue on macOS.

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[sourcery-ai]

Hey @XMLHexagram - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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