bitwarden-desktop: Build desktop proxy

[alexyao2015]

Add desktop_proxy to $out/bin and patches bitwarden code to find the desktop proxy.

This reworks #374068 to address comments and remove the extra manifest additions since those are generated by the bitwarden app itself.

fixes #347350
closes #374068

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• Nixpkgs 25.11 Release Notes (or backporting 25.05 Nixpkgs Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
• NixOS 25.11 Release Notes (or backporting 25.05 NixOS Release notes)
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other contributing documentation in corresponding paths.

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[SuperSandroBot]

nixpkgs-review result

Generated using nixpkgs-review-gha

Command: nixpkgs-review pr 425477
Commit: 875383a0e559c59182dbfbf0cc6c2784060b517c (subsequent changes)
Merge: 69a98e458d13b599303be76dd6ce096b7c6ccebc

Logs: https://github.com/SuperSandro2000/nixpkgs-review-gha/actions/runs/17224180178

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x86_64-linux

✅ 1 package built:

• bitwarden-desktop

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aarch64-linux

✅ 1 package built:

• bitwarden-desktop

---

x86_64-darwin (sandbox = true)

✅ 1 package built:

• bitwarden-desktop

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aarch64-darwin (sandbox = true)

✅ 1 package built:

• bitwarden-desktop

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/bitwarden-unlock-with-system-authentication-on-nixos/68643/1

[nyabinary]

~> /nix/store/ff59lis9h6m4p9516frzx42in2a61ss5-bitwarden-desktop-2025.8.1/libexec/desktop_proxy
19:30:08 [INFO] Starting Bitwarden IPC Proxy.
19:30:08 [INFO] Process args: []
19:30:08 [INFO] Attempting to connect to /home/nyan/.cache/com.bitwarden.desktop/app.bitwarden
19:30:08 [ERROR] IPC client connection error: No such file or directory (os error 2)

Getting this for some reason (I tried running the desktop proxy manually after seeing it didn't work and got this error)

EDIT: Ignore that, got that fixed but for some reason the app doesn't get the prompt to enable fingerprinting even though I enabled the integration on both sides?

[g0r3]

I have the same problem as @nyabinary