chore: merge main and solid2 (major conflicts)

[davedbase]

solid2(Solid 2.0 migration) had fallen behindmain, which picked up one large commit restructuring the docs app onto @kobalte/solidbase(new theme, filesystem-based sidebar, Tailwind v4, regenerated lockfile). Rebasing directly produced ~30 conflicts because both branches touched the same docs files and severalpackages/corefiles. Rather than rewrite the sharedsolid2branch (which other in-flight branches —v2/card, v2/steps, v2/tags-inputs, etc. — are based on and would need to force-push/rebase again), this rebase was done on a new branch, solid2-rebased, based off solid2and replayed ontoorigin/main. solid2` itself is untouched.

What changed

• Docs app infra: removed the pre-solidbase docs files that main deleted (app.config.ts, tailwind.config.cjs, header.tsx, theme-selector.tsx, root.css, etc.) — solid2's edits to them were superseded by the new vite.config.ts/solidbase-theme/Layout.tsx. New component doc pages solid2 added (calendar, drawer, otp-field, resizable) were moved into main's new core/(1)components/ directory structure.
• Docs example files: merged import-ordering/duplicate-import conflicts in combobox.tsx, radio-group.tsx, segmented-control.tsx, tabs.tsx, toggle-button.tsx, toggle-group.tsx, and CSS module dark-theme selector conflicts (kept [data-theme*="dark"], consistent with the rest of each file, over a stale [data-kb-theme="dark"]).
• packages/core/src: resolved 8 files where main's pre-Solid-2.0 code (local.onChange pattern) conflicted with solid2's rewrite (mergedProps, omit(), JSX.ChangeEventHandlerUnion) — kept solid2's side throughout. One exception: kept a real bug fix from main's side in create-single-select-list-state.ts (guards against setSelectedKey(undefined) when a selection is cleared).
• Root/package configs: merged package.json devDependencies (kept solid2's Solid-2.0-tested tooling versions — jsdom/vitest/vite/testing-library — over main's independently-bumped versions, since those weren't tested against the Solid 2.0 betas), packages/{core,tests,utils}/package.json peerDependencies (Solid 2.0 versions), pnpm-workspace.yaml overrides/allowBuilds/minimumReleaseAgeExclude (union of both, dropped main's solid-js: ">=1.9.14" override since that range excludes the 2.0.0-beta.15 prerelease), and tsconfig.json (jsxImportSource: @solidjs/web, moduleResolution: Bundler).
• Follow-up fix commit (e57bb63a) for regressions the merge auto-resolved silently (no conflict markers, so easy to miss):
  • Root tsconfig.json had lost @testing-library/jest-dom from its types array (main's docs commit dropped it) — broke expect(...).toHaveAttribute(...) etc. across every test file in @kobalte/core.
  • apps/docs was still pinned to solid-js@1.8.15/no @solidjs/web, but now depends on @kobalte/core which requires Solid 2.0 — caused JSX.Element/RenderedElement type mismatches. Bumped both to 2.0.0-beta.15.
  • Regenerating pnpm-lock.yaml let @internationalized/date float from 3.4.0 to 3.12.2 (still satisfies the ^3.4.0 range but has breaking type changes). Pinned via pnpm-workspace.yaml override.

Verification

• pnpm -F @kobalte/core -F @kobalte/utils -F @kobalte/tests typecheck — passes with the exact same (pre-existing, unrelated) failures as unmodified solid2 (verified by diffing error output against a baseline run on solid2 before any changes).
• apps/docs typecheck — same, once the JSX mismatch was fixed; remaining errors are pre-existing (stale .d.ts output caused by a pre-existing number-field-input.tsx @ts-expect-error bug that also fails tsup's dts build on plain solid2).
• pnpm -F @kobalte/core test — 466 passed, 112 skipped (pre-existing it.skips), 0 failing.

Notes for reviewer

• solid2 was left untouched on purpose — branches built on it don't need to rebase yet. If this gets merged, solid2 (and anything based on it) should be rebased onto this branch's tip (or onto main after this merges) at some point.
• The number-field-input.tsx unused-@ts-expect-error bug and the docs-app .d.ts-resolution gaps are pre-existing on solid2 and out of scope here — flagging in case they should be tracked separately.
• No PR has been opened yet — branch is pushed to origin/solid2-rebased, waiting on a decision of whether to target solid2 or main.

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