docs(mix): consolidate chained widget modifiers

[leoafarias]

The modifier guide repeats .wrap() where one chained configuration expresses the same style. Consolidate the card example and both default-order examples, preserving the comparison that demonstrates order independence for distinct modifier types.

Consolidate the custom-order example and correct its comments: the first resolved modifier is the outermost wrapper. No runtime API changes.

Validation:

• 46 site tests passed.
• Flutter preview build and manifest validation passed (74 entries).
• Production website build and Pagefind indexing passed (existing lint/Nextra warnings).
• The companion Mix PR refactor(mix): consolidate example widget modifiers mix#1090 verifies style equality and default/custom wrapper rendering; 30 focused modifier tests passed.
• git diff --check passed.

GitHub CI: all checks passed for 1f7ee27890daf9dee2923dcbc7a50ed0e820c19c, including preview artifacts + website, CodeQL, and Vercel deployment.

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Project	Deployment	Actions	Updated
mix-docs	Ready	Preview	Oct 6, 2026 3:07am UTC

[tilucasoli]

LGTM