platform refactor

[faukah]

Move core logic to platform.rs.
Depends on #436 and #445.

Sanity Checking

• I have updated the changelog as per my changes
• I have tested, and self-reviewed my code
• Style and consistency
  • I ran nix fmt to format my Nix code
  • I ran cargo fmt to format my Rust code
  • I have added appropriate documentation to new code
  • My changes are consistent with the rest of the codebase
• Correctness
  • I ran cargo clippy and fixed any new linter warnings.
• If new changes are particularly complex:
  • My code includes comments in particularly complex areas to explain the
    logic
  • I have documented the motive for those changes in the PR body or commit
    description.
• Tested on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin

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