Complete blueprint.js removal

[jumpinjackie]

Fixes #1450

Summary

Removes Blueprint.js as a UI dependency from mapguide-react-layout, completing the migration to the toolkit-agnostic IElementContext abstraction. The default (and now only) provider is MinimalProvider — a zero-dependency implementation using semantic HTML and CSS custom properties.

What changed

Dependencies removed

• @blueprintjs/core — removed from devDependencies, peerDependencies, and peerDependenciesMeta
• @blueprintjs/icons — removed from peerDependencies and peerDependenciesMeta
• All Blueprint-related build configuration (BLUEPRINT_NAMESPACE define, iconSvgPaths aliases in Vite & Storybook)

Files deleted

• src/components/elements/providers/blueprint/ (22 files) — the entire Blueprint provider
• stdassets/bp-icons.js — SVG path subset (paths now embedded in minimal provider)

Visual parity improvements

• Intent colors — updated to match Blueprint 3.x palette exactly (primary #137CBD, danger #DB3737, warning #D9822B, success #0F9960)
• Input groups — height, line-height, and right-element padding adjusted to match Blueprint sizing
• Right-element buttons — border-radius, padding, and positioning matched
• Checkbox/radio — size increased to 16px with proper vertical alignment
• Color expr editor — background color and contrast text now render on the input directly

Leaked bp3 classes cleaned up

• src/styles/index.css — removed .bp3-select:after and .bp3-dark rules
• src/containers/measure.tsx — bp3-label → FormGroup element
• viewer/css/limegold.css, viewer/css/turquoise-yellow.css — bp3-tab* → mrl-tab*
• Story files — bp3-heading → Heading element

Naming sanitized

• svg-icons.tsx: IBlueprintPathMap → ISvgPathMap, BP_ICONS_20 → SVG_ICON_PATHS_20, getBlueprintIconPaths → getSvgIconPaths
• icon-map.ts: parameter blueprintName → iconName
• Comments in neo-map-viewer.tsx, map-viewer-swipe.tsx, flyout-region.tsx — Blueprint references removed

Documentation updated

• docs_dev/content/UI_CUSTOMIZATION.md — removed Blueprint provider section; updated reference link
• docs_dev/content/README.md, README.md — removed Blueprint from credits
• docs_dev/content/KNOWN_ISSUES.md — removed resolved Blueprint backdrop issue
• docs_dev/content/VISUAL_REGRESSION.md — updated example text
• src/stories/docs/common-elements.md — updated toolkit description
• DONOTUPGRADE.md — updated decoupling note

Test comments updated

• test/containers/add-manage-layers.spec.tsx
• test/containers/selection-panel.spec.tsx

Breaking changes

None for end users. Blueprint was already an optional peer dependency and not included in the default viewer.js bundle. The MinimalProvider was already the default since 0.15.

Users who explicitly mounted the Blueprint provider in custom bundles will now fall through to MinimalProvider. They should remove the BpProvider import and Blueprint CSS imports from their custom entry points.

Manual testing plan

1. Build with yarn run build:prod
2. Load any viewer template against a MapGuide server — verify all UI renders correctly
3. Test expression editors (String, Number, Boolean, Color, Slider) — verify alignment and color contrast
4. Test input groups with right elements — verify button padding and border-radius
5. Run yarn test:visual:update to regenerate baselines, then git diff visual-snapshots/ to review visual changes

[github-actions]

Bundle Size Report ✅ PASS

Metric	Size	Gzip	Brotli
Total	8.78 MB	2.24 MB	1.77 MB
Diff	-10.92 KB 🟢 ↓	-1.81 KB 🟢 ↓	-1.21 KB 🟢 ↓
Change	-0.12%	-0.08%	-0.07%

Top Changes

File	Before	After	Diff
~ vendor.js	92.31 KB	91.54 KB	-780.00 B 🟢 ↓
~ vendor-debug.js	131.81 KB	131.38 KB	-448.00 B 🟢 ↓
~ chunks/geotiff-codecs-debug.js	68.54 KB	68.85 KB	+320.00 B 🔴 ↑
~ chunks/geotiff-codecs.js	58.67 KB	58.84 KB	+176.00 B 🔴 ↑
~ viewer-debug.js	162.56 KB	162.40 KB	-172.00 B 🟢 ↓

_{Generated by build-size-diff Commit: a0c85cd}

[coveralls]

coverage: 61.081% (+1.0%) from 60.053% — chore/remove-blueprint into master