Shorten Black Friday banner display window

[adriaandotcom]

Summary

• shorten the Black Friday period logic so banners end on the Wednesday after the event while keeping the 3-week lead-in

Testing

• not run (Node/npm unavailable in environment)

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Codex Task

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Note

Shortens the Black Friday banner window to end the Wednesday after Black Friday while keeping the 3-week lead-in.

• Timing logic:
  • Update useIsBlackFridayPeriod in composables/booleans.js:
    • Change end date from +7 to +6 days after Black Friday for both current and next year (keep banner through Wednesday).
    • Update function docstring to reflect new window.

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