feat(html): add slider element

[mihar-22]

Refs #275

Summary

Generic slider custom elements — structural building blocks that domain sliders (time, volume) compose with.

API Surface

Elements: <media-slider>, <media-slider-track>, <media-slider-fill>, <media-slider-buffer>, <media-slider-thumb>, <media-slider-value>

Context: sliderContext / SliderContextValue — state, pointerValue, thumbAttrs, thumbProps, formatValue

Events: SliderEventMap — value-change, value-commit, drag-start, drag-end

Properties (<media-slider>): label, disabled, thumbAlignment

Testing

pnpm -F @videojs/html test src/ui/slider — 23 tests

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📦 Bundle Size Report

Package	Size	Diff		%
@videojs/core	10.22 kB	+5 B	░░░░░░░░	+0.0%	🔺
@videojs/element	1.60 kB	0 B	░░░░░░░░	0%	✅
@videojs/html	17.94 kB	+684 B	████████	+3.9%	🔺
@videojs/icons	3.79 kB	0 B	░░░░░░░░	0%	✅
@videojs/react	14.83 kB	-10 B	░░░░░░░░	-0.1%	🔽
@videojs/store	1.95 kB	0 B	░░░░░░░░	0%	✅
@videojs/utils	2.81 kB	0 B	░░░░░░░░	0%	✅

Total: 53.13 kB · +679 B · +1.3%

---

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	%
.	4.21 kB	4.21 kB	-2 B	-0.0%	🔽
./dom	6.01 kB	6.01 kB	+7 B	+0.1%	🔺
total	10.21 kB	10.22 kB	+5 B	+0.0%

@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	%
.	14.07 kB	14.73 kB	+674 B	+4.7%	🔺
./video	1.08 kB	1.08 kB	+4 B	+0.4%	🔺
./audio	1.07 kB	1.06 kB	-10 B	-0.9%	🔽
./background	1.05 kB	1.07 kB	+16 B	+1.5%	🔺
total	17.27 kB	17.94 kB	+684 B	+3.9%

@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%	✅
total	3.79 kB	3.79 kB	0 B	0%

@videojs/store

Entry	Base	PR	Diff	%
.	1.29 kB	1.29 kB	0 B	0%	✅
./html	468 B	468 B	0 B	0%	✅
./react	204 B	204 B	0 B	0%	✅
total	1.95 kB	1.95 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.