feat(react): add slider preview component

[mihar-22]

Closes #658

Summary

Add Slider.Preview — a positioning container that tracks the pointer along the slider for preview content (time values, thumbnails, chapter titles).

Changes

• CSS-only positioning with min(max(...)) clamping via ResizeObserver
• noClamp prop for previews extending beyond slider bounds
• Re-exported as Slider.Preview, TimeSlider.Preview, VolumeSlider.Preview

Testing

pnpm -F @videojs/react test src/ui/slider/tests/slider-preview

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[github-actions]

📦 Bundle Size Report

Package	Size	Diff		%
@videojs/core	10.49 kB	+79 B	████░░░░	+0.7%	🔺
@videojs/element	1.60 kB	0 B	░░░░░░░░	0%	✅
@videojs/html	27.68 kB	+107 B	██░░░░░░	+0.4%	🔺
@videojs/icons	7.49 kB	0 B	░░░░░░░░	0%	✅
@videojs/react	15.37 kB	+232 B	████████	+1.5%	🔺
@videojs/store	1.96 kB	0 B	░░░░░░░░	0%	✅
@videojs/utils	2.81 kB	0 B	░░░░░░░░	0%	✅

Total: 67.40 kB · +418 B · +0.6%

---

Entry Breakdown

Subpath sizes are the additional bytes on top of the root entry point, measured by bundling root + subpath together and subtracting the root-only size.

@videojs/core

Entry	Base	PR	Diff	%
.	4.40 kB	4.40 kB	0 B	0%	✅
./dom	6.02 kB	6.10 kB	+79 B	+1.3%	🔺
total	10.42 kB	10.49 kB	+79 B	+0.7%

@videojs/element

Entry	Base	PR	Diff	%
.	817 B	817 B	0 B	0%	✅
./context	823 B	823 B	0 B	0%	✅
total	1.60 kB	1.60 kB	0 B	0%

@videojs/html

Entry	Base	PR	Diff	%
.	15.51 kB	15.59 kB	+89 B	+0.6%	🔺
./video	9.74 kB	9.70 kB	-39 B	-0.4%	🔽
./audio	1.34 kB	1.35 kB	+11 B	+0.8%	🔺
./background	1012 B	1.03 kB	+46 B	+4.5%	🔺
total	27.57 kB	27.68 kB	+107 B	+0.4%

@videojs/icons

Entry	Base	PR	Diff	%
./react	2.27 kB	2.27 kB	0 B	0%	✅
./html	1.52 kB	1.52 kB	0 B	0%	✅
./render	1.59 kB	1.59 kB	0 B	0%	✅
./element	2.11 kB	2.11 kB	0 B	0%	✅
total	7.49 kB	7.49 kB	0 B	0%

@videojs/store

Entry	Base	PR	Diff	%
.	1.31 kB	1.31 kB	0 B	0%	✅
./html	472 B	472 B	0 B	0%	✅
./react	199 B	199 B	0 B	0%	✅
total	1.96 kB	1.96 kB	0 B	0%

@videojs/utils

Entry	Base	PR	Diff	%
./array	104 B	104 B	0 B	0%	✅
./dom	928 B	928 B	0 B	0%	✅
./events	227 B	227 B	0 B	0%	✅
./function	261 B	261 B	0 B	0%	✅
./object	119 B	119 B	0 B	0%	✅
./predicate	265 B	265 B	0 B	0%	✅
./string	148 B	148 B	0 B	0%	✅
./style	185 B	185 B	0 B	0%	✅
./time	478 B	478 B	0 B	0%	✅
./number	158 B	158 B	0 B	0%	✅
total	2.81 kB	2.81 kB	0 B	0%

---

ℹ️ How to interpret

Sizes are minified + brotli, measured with esbuild.
Package totals are computed as root size + marginal subpath costs.
Subpath marginal cost = (root + subpath bundled together) − root alone.

Icon	Meaning
✅	No change
🔺	Increased ≤ 10%
🔴	Increased > 10%
🔽	Decreased
🆕	New (no baseline)

Run pnpm size locally to check current sizes.