Rename palette color keys to match Bootstrap variable names

[jjroelofs]

Summary

Rename DXPR Theme palette color keys so their names directly communicate which Bootstrap CSS variables and classes they control. This eliminates the mapping layer that AI agents (and humans) currently need to memorize.

Proposed Renaming

Current Key	Proposed Key	Bootstrap Variable	Why
base	primary	--bs-primary	Direct Bootstrap match
basetext	primary_text	--bs-primary-text	Pairs with primary
accent1	secondary	--bs-secondary	Direct Bootstrap match
accent1text	secondary_text	--bs-secondary-text	Pairs with secondary
accent2	tertiary	(custom)	Extends Bootstrap naming pattern
accent2text	tertiary_text	(custom)	Pairs with tertiary
silver	light	--bs-light	Direct Bootstrap match
headings	dark	--bs-dark	Direct Bootstrap match
text	body_color	--bs-body-color	Direct Bootstrap match
body	body_bg	--bs-body-bg	Direct Bootstrap match
link	link_color	--bs-link-color	Direct Bootstrap match
graylight	muted	--bs-secondary-color	Bootstrap muted concept
graylighter	border_color	--bs-border-color	Direct Bootstrap match
card	card_bg	(region)	Clarifies it's a background
cardtext	card_text	(region)	Consistent naming
footer	footer_bg	(region)	Clarifies it's a background
footertext	footer_text	(region)	Consistent naming
header	header_bg	(region)	Clarifies it's a background
headertext	header_text	(region)	Consistent naming
headerside	sidebar_bg	(region)	Clarifies it's a background
headersidetext	sidebar_text	(region)	Consistent naming
secheader	topbar_bg	(region)	Clarifies it's a background
secheadertext	topbar_text	(region)	Consistent naming
pagetitle	hero_bg	(region)	Clarifies it's a background
pagetitletext	hero_text	(region)	Consistent naming

Motivation

• AI agents currently cannot infer that base maps to btn-primary or that accent1 maps to btn-secondary without explicit documentation
• The current names evolved organically and don't communicate their Bootstrap relationship
• Bootstrap-aligned names make the palette self-documenting for both AI and human users
• Region colors gain _bg/_text suffixes making their role unambiguous

Migration

• Requires backwards-compatible migration path (support old keys + new keys during transition)
• Update color scheme presets
• Update all references in CSS builder, config schema, form, and SKILL.md
• Update dxt:palette:set and dxt:config:set to accept both old and new key names during transition

Related

• SKILL.md now documents the palette→Bootstrap mapping table as a stopgap
• dxt:palette:get command being added to surface this mapping at runtime