fix(build): update Nix flake hash and package-lock.json

[zortos293]

This PR fixes the Nix flake build failure (issue #570) caused by a stale npm dependency hash and missing registry metadata in the lockfile.

Fixes #570.

The build failed because opennow-stable/package-lock.json was missing resolved and integrity fields for over 480 packages, and the encoding dependency was entirely absent. buildNpmPackage requires this metadata to cache dependencies reproducibly.

Changes:

• Updated npmDepsHash in flake.nix to match the corrected lockfile
• Populated missing resolved and integrity fields in opennow-stable/package-lock.json
• Added encoding@0.1.13 entry to satisfy node-fetch and minipass-fetch dependencies
• Added preBuild hook in flake.nix to symlink locales directory for the build process
• Updated ensure-electron-installed.mjs to respect ELECTRON_SKIP_BINARY_DOWNLOAD

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Note

Low Risk
Build-only Nix packaging changes with no runtime application logic or security-sensitive behavior.

Overview
Fixes the Nix buildNpmPackage build by updating npmDepsHash in flake.nix so the fixed npm dependency set hashes correctly for reproducible caching.

Adds a preBuild hook that symlinks the repo-root locales directory to ../locales during the build. The app sources translations from that path (e.g. i18n.ts imports ../../../../locales/*.json), but the Nix src is only opennow-stable, so the symlink restores the layout the bundler expects.

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