Fix two 1.3.0 regressions reported on the support forum

[puikinsh]

Two users reported problems after the 1.3.0 update. Both are mine.

1. Links taking the button colour

unwanted link color — customizer set to #006699, links rendering #5D47D7.

The theme-mod → theme.json bridge mapped link_color and button_color onto the same primary slug, so the second write silently overwrote the first. Reproduced exactly — with both mods set, the page emitted:

:root{--wp--preset--color--primary:#5d47d7;}

Buttons now get their own button / button-hover palette slots.

There's a subtler reason this matters. theme.json's link rule and the theme's own customizer CSS have equal specificity, so which wins depends on emission order — and a caching or optimisation plugin that reorders CSS can flip it. That's likely why it hit some sites and not a stock install. With the slugs separated, both rules resolve to the same colour, so the outcome no longer depends on winning that tie.

2. Child themes replacing Bootstrap / FlexSlider / Owl Carousel

Update breaks navigation.

1.3.0 renamed four generic handles so a plugin claiming bootstrap couldn't suppress the theme's stylesheet. That fixed a real fault — but silently broke the most common child-theme pattern there is:

wp_dequeue_style( 'bootstrap' );   // swap in my own build

After the rename that names a handle nobody registers. It does nothing, the parent's Bootstrap comes back, and it lands on top of whatever the child replaced it with. Nothing errors — the layout just changes under them on update.

Reproduced with a two-line child theme: bootstrap stylesheets on the page went 0 (1.2.21) → 1 (1.3.0).

Each old handle is now registered as an empty placeholder and enqueued; a late hook mirrors any dequeue of it onto the real stylesheet. The placeholder is only registered when nothing else has claimed the handle, so the theme isn't back to squatting on generic names.

Verified — all three cases that must hold at once

case	result
child theme dequeues bootstrap	0 stylesheets (was 1 in 1.3.0)
default site, nothing dequeued	1 stylesheet, shapely-bootstrap
plugin claims bootstrap first	both load; theme's not suppressed

13 pages crawled, 0 failures, 0 fatals, 0 theme lines in WP_DEBUG_LOG.

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