Set edit meal back button minimal

[thorethy1]

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Description

What problem does this PR solve?
(Keep it concise. 1–2 sentences.)

• Set EditLoggedMeal to use headerBackButtonDisplayMode: 'minimal' explicitly.
• Keeps the native header contract green without relying on native-stack default back-title behavior.

Why

The native header contract requires root-stack screens with a real iOS back button to explicitly choose either a stable headerBackTitle or headerBackButtonDisplayMode: 'minimal'. EditLoggedMeal can appear minimal in the app today, but that is implicit native-stack behavior and can vary with navigation context.

Follow-up

A larger navigation refactor could move tab-owned routes such as diary rows/details into their tab-local stacks. That would make back behavior more natural, reduce root-stack special cases, and improve maintainability. Should we plan that as a separate PR?

Validation

• cd SparkyFitnessMobile && ./node_modules/.bin/jest --watchman=false --runInBand --coverage=false __tests__/navigation/nativeHeaderContract.test.ts
• cd SparkyFitnessMobile && ./node_modules/.bin/eslint App.tsx --max-warnings 0
• cd SparkyFitnessMobile && ./node_modules/.bin/tsc --noEmit

Linked Issue: #1675

PR Type

• Issue (bug fix)
• New Feature
• Refactor
• Documentation

Checklist

All PRs:

• [MANDATORY - ALL] Integrity & License: I certify this is my own work, free of malicious code, and I agree to the License terms.

New features only:

• [MANDATORY for new feature] Alignment: I have raised a GitHub issue and it was reviewed/approved by maintainers or it was approved on Discord.

Frontend changes (SparkyFitnessFrontend/):

• [MANDATORY for Frontend changes] Quality: I have run pnpm run validate and it passes.
• [MANDATORY for Frontend changes] Translations: I have only updated the English (en) translation file.

Backend changes (SparkyFitnessServer/):

• [MANDATORY for Backend changes] Code Quality: I have run typecheck, lint, and tests. New files use TypeScript, new endpoints have Zod schemas, and new endpoints include tests.
• [MANDATORY for Backend changes] Database Security: I have updated rls_policies.sql for any new user-specific tables.

UI changes (components, screens, pages):

• [MANDATORY for UI changes] Screenshots: I have attached Before/After screenshots below.

Mobile changes (SparkyFitnessMobile/):

• [MANDATORY for Mobile changes] Tested on device or emulator: I have verified the changes work on iOS or Android.

[github-actions]

PR Validation Results

Change Detection

• 📱 Mobile changes detected

✅ All checks passed. Thank you!

[gemini-code-assist]

Code Review

This pull request updates the navigation options for the EditLoggedMeal screen in SparkyFitnessMobile/App.tsx by replacing the headerBackTitle option with headerBackButtonDisplayMode set to 'minimal'. There are no review comments, and I have no feedback to provide.

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