fix(date-picker): hide outside dates in multi-month views

[geoquant]

Summary

Hide dates outside each calendar panel's month by default in multi-month DatePicker views, so dates and selected ranges are not duplicated between panels.

• Replace the directional primary/secondary highlights with hidden outside-month dates.
• Remove the range-origin state, custom day wrapper, and secondary-color CSS.
• Preserve existing single-month behavior and explicit showOutsideDays overrides.
• Keep cross-month range selection, keyboard navigation, and disabled-date behavior intact.
• Update the documentation, patch changeset, and browser regression tests.

Validation

• 30 date-picker browser tests pass, covering Kumo and FedRAMP in light/dark modes, selected-date visibility, forward/backward range selection, min constraints, uncontrolled keyboard selection and focus, navigation, disabled dates, all three selection modes, and explicit outside-day overrides.
• Library typecheck and lint pass.
• 1,407 unit tests and changed-file formatting checks passed for this implementation before it was stashed; browser tests, typecheck, and lint were rerun after restoring it.

---

• Reviews
  • bonk has reviewed the change
  • automated review not possible because: No automated code reviewer was invoked in this local session; the restored diff was inspected and validated locally.
• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:

[pkg-pr-new]

npm i https://pkg.pr.new/@cloudflare/kumo@831

commit: c849c2c

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Commit: c849c2c

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Visual contracts

Linux Chromium references exercised by the PR's visual-contracts job.

1 curated contract

truncating text trigger

[github-actions]

📐 Bundle Size

Consumer fixtures bundled against packages/kumo/dist (peers external, minified ESM).

Fixture	Raw	Gzip	Brotli
Button (root)	166.3 KB	50.9 KB	44.1 KB
Button (components/button)	166.2 KB	50.9 KB	44.1 KB
Button + Dialog + Select (root)	291.1 KB	86.8 KB	72.9 KB
Button + Dialog + Select (component subpaths)	291.1 KB	86.8 KB	72.8 KB
Chart (root)	238.6 KB	72.0 KB	61.8 KB
Chart (components/chart)	238.6 KB	72.0 KB	61.9 KB
Badge (components/badge)	36.5 KB	12.7 KB	11.1 KB
Flow (components/flow)	200.6 KB	59.2 KB	51.7 KB
Button (primitives/button)	12.2 KB	4.4 KB	3.9 KB
Primitives barrel	635.8 KB	176.8 KB	139.3 KB
Code highlighting (code)	2.07 MB	469.2 KB	350.4 KB

npm tarball: 546 files, 1.50 MB packed, 6.94 MB unpacked.

⚠️ 24 flagged files in tarball (tests / raw scripts)

• dist/blocks-source/delete-resource/delete-resource.test.tsx
• dist/blocks-source/resource-list/resource-list.test.tsx
• scripts/component-registry/cache.ts
• scripts/component-registry/discovery.ts
• scripts/component-registry/example-cleanup.ts
• scripts/component-registry/index.test.ts
• scripts/component-registry/index.ts
• scripts/component-registry/markdown-generator.ts
• scripts/component-registry/metadata.ts
• scripts/component-registry/props-filter.ts
• scripts/component-registry/schema-generator.ts
• scripts/component-registry/sub-components.ts
• scripts/component-registry/types.ts
• scripts/component-registry/utils.ts
• scripts/component-registry/variant-parser.ts
• scripts/css-build.ts
• scripts/generate-globe-land-mask.mjs
• scripts/generate-primitives.ts
• scripts/theme-generator/config.ts
• scripts/theme-generator/generate-css.test.ts
• scripts/theme-generator/generate-css.ts
• scripts/theme-generator/index.ts
• scripts/theme-generator/migrate.ts
• scripts/theme-generator/types.ts

Report-only: no size thresholds are enforced yet.

Commit: c849c2ca