fix: add name_loc property for compatibility with Svelte 5.42+

[baseballyama]

Summary

• Fixes TypeScript build errors when using Svelte 5.42+ due to the newly required name_loc property
• Adds name_loc to manually constructed Attribute objects in src/parser/html.ts
• Adds name_loc to manually constructed SvelteOptionsRaw objects in src/parser/compat.ts
• Uses type assertions to maintain backward compatibility with older Svelte versions

Test plan

• Build passes with Svelte 5.41.0 (current version in package.json)
• Build passes with Svelte 5.45.4 (latest version)
• All 8581 existing tests pass
• Snapshot tests updated to include new name_loc property

🤖 Generated with Claude Code

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Latest commit: 970f35d

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[coveralls]

Pull Request Test Coverage Report for Build 19898487661

Details

• 15 of 18 (83.33%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 94.707%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/parser/html.ts	6	9	66.67%

Totals
Change from base Build 19895901968:	-0.01%
Covered Lines:	10692
Relevant Lines:	11166

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💛 - Coveralls