feat: mobile mini-cart dropdown tap + per-unit max for responsive range

[HardeepAsrani]

Summary

Pro PR: #4512

Addresses #3159 (mini-cart dropdown on mobile tap) and #3161 (width support for the header search form).

Search form width (Pro + theme)

The header search form had no width control, so it always rendered at its intrinsic width and couldn't be stretched to dominate the header.

• Added a responsive Width control (field_width, px / %) on the Advanced Search Form.
• Added a Stretch to fill available space toggle (flex_grow).

Mobile mini-cart dropdown (theme)

On mobile the dropdown mini-cart was hidden and tapping the cart icon just navigated to the cart page. Now, below the 960px breakpoint, tapping toggles the dropdown preview so customers can review the cart and keep shopping.

Will affect visual aspect of the product

YES/NO

Screenshots

Test instructions

Requires Neve + Neve Pro + WooCommerce active. Hard-refresh / clear cache before testing so rebuilt assets load.

A. Search width (#3161) — Customize → Header → add Advanced Search Form → Style tab

• Controls present: new Width slider (with % / px unit buttons) and Stretch to fill available space toggle.
• Width px: switch to px, set ~600 → field widens live; slider allows up to 1200.
• Width %: switch to % → slider caps at 100; switching px→% clamps an out-of-range value (e.g. 600 → 100).
• Per-device: set different values on desktop/tablet/mobile tabs → each applies at its breakpoint.
• Stretch: toggle on (preview reloads) → field expands to fill its row.

B. Mobile mini-cart dropdown (#3159) — Cart Icon in header

• Tap to open: tap the cart icon → dropdown preview opens, page does not navigate.
• Tap to close: tap the icon again → closes.
• Outside tap: open, then tap outside the dropdown → closes.
  I- nner actions: View cart / Checkout links navigate; removing a line item works via AJAX and the dropdown stays open.
• Empty cart: empty cart → tapping the icon follows the default link to the cart page (no empty popup).
• Desktop ≥960px: hover still opens the dropdown; clicking the icon still goes to the cart page (tap logic doesn't interfere).

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
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