docs(mobile): fix broken @navigate examples (double-quoted plain routes)

[shanerbaner82]

The documented @navigate="/route" form fails to compile. The Blade precompiler (NativeTagPrecompiler) treats a double-quoted @navigate value as a PHP expression, so a plain route compiles to nav('navigate', null, /item/42) and PHP throws a parse error. Single-quoted routes are wrapped in quotes and work.

This updates the examples to working forms:

• Plain routes use single quotes: @navigate='/item/42', @navigate.replace='/login', and so on.
• Dynamic routes are built in PHP: @navigate="'/detail/' . $item->id" (a {{ }} echo inside @navigate is not interpolated).
• A short note explains that double quotes hold a PHP expression.

Docs only. The precompiler is not changed. Every updated example was checked against the precompiler regex and run through PHP.