feat: add sorting by file size

[baracchande]

Summary

core/library/alchemy/enums.py: Added SIZE = "file.size" to SortingModeEnum

core/library/alchemy/library.py

• search_library(): when SIZE mode is active, skips SQL ordering (falls back to Entry.id) and calls _sort_ids_by_file_size() after the query returns.
• New method _sort_ids_by_file_size(): bulk-fetches all entry paths in one query, calls stat().st_size on each file, returns the IDs sorted by size. Missing/unlinked files get size -1 and sort to the front (ascending).

Added "file.size" key with a proper translation in each translation file.

tests/test_search.py: Four new tests.

This implements the file size sort option requested in 207

Tasks Completed

• Platforms Tested:
  • Windows x86
  • Windows ARM
  • macOS x86
  • macOS ARM
  • Linux x86
  • Linux ARM
• Tested For:
  • Basic functionality
  • PyInstaller executable

[Computerdores]

This breaks when the query has a LIMIT due to the page size.

[Computerdores]

Also, unless you speak 19 languages those are AI/machine translations and I would prefer not having those in here.

Because while I'm not sure whether we have an official policy on AI/machine translations, I would personally prefer a high quality of translations over a high quantity (and people are less likely to contribute when translations are suboptimal rather than missing), so I would prefer a missing translation over an AI one (also should we redecide in the future we can do the AI translations ourselves, where as we won't have any idea how good our translations are if we allow AI translations).