Revert "Back to Bun (it now supports arm builds)"

[martpie]

This reverts commit 0174b88.

Alternative to #937, see motivation there

[Copilot]

Pull request overview

This PR reverts the project’s “back to Bun” tooling change by moving the dev/build workflow back to Node.js + npm, updating related docs/config, and removing Bun-specific artifacts.

Changes:

• Switch Tauri build hooks, Git hooks, docs, and CI workflows from bun commands to npm commands.
• Remove Bun-specific dependency/types and delete the bun.lock lockfile.
• Add Node/npm version expectations via devEngines in package.json.

Reviewed changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/translations/languages.ts	Updates contributor instructions to use npm run gen:translations.
src-tauri/tauri.conf.json	Updates frontend build commands to npm run ... (and removes JSON schema line).
src-tauri/src/plugins/file_associations.rs	Updates Windows dev test command example to use npm.
package.json	Switches pre-commit hook command to npm, removes @types/bun, adds devEngines.
bun.lock	Removes Bun lockfile.
README.md	Updates setup/dev/build docs from Bun to Node/npm.
AGENTS.md	Updates documented dev commands from Bun to npm.
.npmrc	Updates npm config (adds audit=false).
.github/workflows/build.yml	Switches CI from setup-bun + Bun commands to setup-node + npm commands.

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