feat(html): add thumbnail element

[mihar-22]

Ref: #501
Stacked on: #643

Summary

<media-thumbnail> custom element and TimeElement simplification.

@videojs/html

<media-thumbnail> element

Tag	media-thumbnail
Property	time: number
Shadow DOM	<img part="img">
Sizing	max-width / max-height on host → auto-scales proportionally
Data attrs	data-loading, data-error, data-hidden

<media-thumbnail time="10"></media-thumbnail>

media-thumbnail { max-width: 200px; max-height: 150px; }

TimeElement (incidental)

Simplifies DOM update — constructor sets up children once, toggles hidden instead of add/remove per update.

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
vjs-10-demo-react	Ignored	Preview	Feb 28, 2026 0:46am

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[github-actions]

📦 Bundle Size Report

Package	Size	Diff		%
@videojs/core	8.21 kB	0 B	░░░░░░░░	0%	✅
@videojs/element	1.60 kB	0 B	░░░░░░░░	0%	✅
@videojs/html	11.43 kB	+851 B	████████	+7.8%	🔺
@videojs/icons	3.79 kB	0 B	░░░░░░░░	0%	✅
@videojs/react	9.69 kB	0 B	░░░░░░░░	0%	✅
@videojs/store	1.94 kB	0 B	░░░░░░░░	0%	✅
@videojs/utils	2.54 kB	0 B	░░░░░░░░	0%	✅

Total: 39.21 kB · +851 B · +2.2%

---

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	%
.	3.86 kB	3.86 kB	0 B	0%	✅
./dom	4.36 kB	4.36 kB	0 B	0%	✅
total	8.21 kB	8.21 kB	0 B	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/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	199 B	199 B	0 B	0%	✅
total	1.94 kB	1.94 kB	0 B	0%

@videojs/utils

Entry	Base	PR	Diff	%
./array	104 B	104 B	0 B	0%	✅
./dom	760 B	760 B	0 B	0%	✅
./events	227 B	227 B	0 B	0%	✅
./function	197 B	197 B	0 B	0%	✅
./object	119 B	119 B	0 B	0%	✅
./predicate	265 B	265 B	0 B	0%	✅
./string	110 B	110 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	2.54 kB	2.54 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.