refactor: simplify internalization resource assignments

[nabalone]

Summary

• centralize project resource assignment logic
• simplify section selection data construction and update desktop/mobile artifact flows
• add unit coverage for section rows and resource assignments

Test plan

• Targeted internalization Jest tests pass
• Renderer TypeScript check passes
• GitHub automated checks pass

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[nabalone]

Merged develop into this branch and resolved the conflict (automated scheduled routine, commit 8ac4f03).

Internalization/SelectSections.tsx — the conflict itself was the MUI import list: you added Checkbox, develop dropped it. Kept Checkbox, since your version of the component renders one in the passage-row cell (develop's version doesn't, which is why develop removed the import).

One thing worth flagging, since it wasn't a conflict marker but would have broken the build: develop's #537 button overhaul deleted AltButton and PriButton in favour of a unified Button, and git auto-merged your side of this file, which still used both. I ported the two call sites following that PR's own convention across all 144 files it touched — AltButton → <Button>, PriButton → <Button color="primary"> — and removed them from the control barrel import. The visual result comes from develop's new theme defaults (variant: 'contained', color: 'secondary'), so give the Cancel/Next row a look to confirm it reads the way you want.

npm run typecheck is clean apart from three pre-existing errors for gitignored local config this environment doesn't have (auth0-variables.json, buildDate.json). Prettier is clean. No tests run.

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