fix(web): bundle Source Serif 4 with Cyrillic coverage #17050

Job	Run time
Resolve runner profiles	10s
Static gate	1d 0h 0m 1s
Detect validation scopes	1d 0h 0m 1s
Validate workspace	0s
Playwright visual (${{ matrix.name }})	0s
Windows tools-pack payload tests	0s
Playwright critical (${{ matrix.group }})	0s
E2E Vitest	0s
Workspace unit tests	0s
Preflight	0s
Web workspace tests	0s
UI P0 (${{ matrix.name }})	0s
	2d 0h 0m 12s

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