chore(format): cover all supported source files

[chhoumann]

Apply Oxfmt consistently to every tracked TypeScript, JavaScript, JSON, JSONC, and YAML file in the repository, and make format:check enforce that complete supported surface going forward.

The previous scripts checked configuration, E2E tests, and scripts but omitted the application source, allowing formatting drift across 123 source files while CI stayed green. This isolates the resulting mechanical churn before any architectural modernization begins. YAML keeps the conventional two-space indentation through explicit EditorConfig and Oxfmt overrides.

Reviewer context:

• No Svelte or Markdown files are changed. Oxfmt's Svelte support is currently disabled and will be enabled in a separate reviewed slice; user-facing prose will get its own docs lane.
• Normalized TypeScript ASTs are identical before and after formatting for all 125 changed TypeScript files.
• Parsed YAML values are structurally identical before and after formatting, including the release workflow's embedded script.
• There is no runtime, persistence, migration, or release behavior change.

Verified with npm run lint, npm run format:check, npm run typecheck, npm run build, npm run test -- --run (876 tests), a complete MkDocs build through the pinned requirements, and git diff --check.

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