146 support different timedate format

[AlixANNERAUD]

This pull request introduces a new internationalized time formatting utility, refactors time decomposition logic for clarity and correctness (especially for negative Unix timestamps), and updates code to use these new utilities. The changes improve maintainability, correctness, and enable locale-independent time formatting throughout the codebase.

Internationalization and Time Formatting

• Added a new format_unix_timestamp function in modules/internationalization/src/time.rs that formats Unix timestamps using Python-like strftime tokens, supporting common date/time patterns and locale-independent AM/PM formatting. Includes tests. (modules/internationalization/src/time.rs, modules/internationalization/Cargo.toml, [1] [2]
• Replaced direct time formatting in executables/shell/graphical/src/layout.rs with the new internationalization::format_unix_timestamp utility. (executables/shell/graphical/src/layout.rs, [1] [2]

Time Decomposition Refactor

• Renamed and improved the function for breaking down Unix timestamps: unix_to_human_time is now decompose_unix_timestamp, with more robust handling of negative timestamps (dates before 1970). Added comprehensive tests for edge cases and leap years. (modules/shared/src/time.rs, [1] [2] [3]
• Updated all usages of the old function to use the new decompose_unix_timestamp name, including in file system time display logic. (modules/file_system/src/time.rs, [1] [2]

Minor Dependency and Module Updates

• Registered the shared crate as a dependency for the internationalization module to allow reuse of time decomposition logic. (modules/internationalization/Cargo.toml, modules/internationalization/Cargo.tomlR8)
• Added a missing dependency declaration for embassy-sync in the synchronization module for consistency across platforms. (modules/synchronization/Cargo.toml, modules/synchronization/Cargo.tomlR6-L11)
• Re-exported the new time formatting utilities from the internationalization module for external use. (modules/internationalization/src/lib.rs, modules/internationalization/src/lib.rsR9-R12)

[codecov]

Codecov Report

❌ Patch coverage is 88.37209% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
modules/internationalization/src/time.rs	87.75%	6 Missing ⚠️
executables/shell/graphical/src/layout.rs	0.00%	3 Missing ⚠️
modules/shared/src/time.rs	96.87%	1 Missing ⚠️

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