feat: add subtitles handling + captions core

[luwes]

fix #687, #498, #498

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[github-actions]

📦 Bundle Size Report

Package	Size	Diff		%
@videojs/core	11.56 kB	+403 B	█████░░░	+3.5%	🔺
@videojs/element	1.60 kB	0 B	░░░░░░░░	0%	✅
@videojs/html	29.96 kB	+805 B	████░░░░	+2.7%	🔺
@videojs/icons	7.49 kB	0 B	░░░░░░░░	0%	✅
@videojs/react	16.71 kB	+278 B	██░░░░░░	+1.7%	🔺
@videojs/store	1.97 kB	0 B	░░░░░░░░	0%	✅
@videojs/utils	2.97 kB	+169 B	████████	+5.9%	🔺

Total: 72.26 kB · +1.62 kB · +2.3%

---

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	%
.	4.63 kB	4.72 kB	+93 B	+2.0%	🔺
./dom	6.54 kB	6.84 kB	+310 B	+4.6%	🔺
total	11.17 kB	11.56 kB	+403 B	+3.5%

@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	%
.	16.56 kB	16.96 kB	+408 B	+2.4%	🔺
./video	10.40 kB	10.60 kB	+207 B	+1.9%	🔺
./audio	1.17 kB	1.23 kB	+63 B	+5.3%	🔺
./background	1.05 kB	1.17 kB	+127 B	+11.9%	🔴
total	29.18 kB	29.96 kB	+805 B	+2.7%

@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	%
.	1.32 kB	1.32 kB	0 B	0%	✅
./html	465 B	465 B	0 B	0%	✅
./react	196 B	196 B	0 B	0%	✅
total	1.97 kB	1.97 kB	0 B	0%

@videojs/utils

Entry	Base	PR	Diff	%
./array	104 B	104 B	0 B	0%	✅
./dom	928 B	1.07 kB	+169 B	+18.2%	🔴
./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	2.97 kB	+169 B	+5.9%

---

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.

[github-actions]

CI Failure Diagnosis

• Run: https://github.com/videojs/v10/actions/runs/22688041263
• Commit: 811af81dfaa3b727ae13758c39bd60d67b7732ab

File	Type	What failed
packages/html/src/ui/captions-button/captions-button-element.ts:41	typecheck	TS2559: AbortSignal passed where { signal?: AbortSignal } options object expected.

[mihar-22]

(request): I did a pass recently to dry up buttons to avoid boilerplate, rebasing on main and aligning with latest would be nice. Your feedback there would be appreciated if you have any :)

[mihar-22]

(question): seems unused? maybe I missed it

[github-actions]

CI Failure Diagnosis

• Run: https://github.com/videojs/v10/actions/runs/22740078936
• Commit: fa70625a677221060a37a642e84ece6bb246a851

File	Type	What failed
packages/core/src/dom/store/features/tests/text-track.test.ts	test	Test expects showing: true/false but implementation now returns mode: "showing"/"disabled" in subtitlesList.