[firsttris]

Moves the frontend in app/ from pnpm and Node to Bun as package manager, script runner and Playwright runner, following firsttris/workflows tech-stack.md ("Tooling") and the migrations of haul and windfenster.

Changes

• app/package.json: packageManager: bun@1.4.4 (was pnpm@12.16.1); scripts chain bun run i18n; e2e is bun --bun playwright test (app/ already has "type": "module").
• app/bun.lock converted from pnpm-lock.yaml by bun install: the same 378 package@version pairs (compared one by one). app/bunfig.toml: linker = "isolated" (pnpm's layout) and minimumReleaseAge = 86400 (pnpm 12's default). pnpm-lock.yaml removed (no other pnpm files or settings existed).
• playwright.config.ts web server: bun --bun vite --mode mock.
• tauri.conf.json: beforeDevCommand/beforeBuildCommand → bun run dev / bun run build.
• justfile: setup, dev, dev-mock, lint, format, test-frontend, e2e, build call bun (bindings is cargo only).
• scripts/screenshots.sh: bun run build, bun --bun vite preview, bun scripts/screenshots.mjs.
• CI (ci.yml, release.yml): oven-sh/setup-bun@v2 with bun-version-file: app/package.json, bun install --frozen-lockfile; no setup-node, pnpm/action-setup or pnpm store cache. Releases build with bun run tauri build (the repo does not use tauri-action). Playwright image from app/bun.lock; in it the E2E job installs Bun with npm install --global "bun@$(node -p ...packageManager...)".
• screenshots.yml: the shared workflow's install installs the same Bun the same way, lockfile: app/bun.lock.
• Renovate: custom manager for packageManager in app/package.json, its own "Bun" group.
• Docs (development.md, installation.md) and packaging/toolbox.sh: Bun instead of Node and pnpm.

Checks (locally)

	pnpm/Node (main)	Bun (this branch)
install --frozen-lockfile	ok	ok, 263 packages, lockfile unchanged
Biome	78 files, 1 warning	78 files, 1 warning (the same)
tsc -b	ok	ok
Vitest + coverage	13 files, 147 tests, 95.39 % lines stmts	13 files, 147 tests, same coverage
vite build	ok	ok
Playwright (mock backend, Chromium)	69 passed, 1 skipped (1 worker)	69 passed, 1 skipped (1 and 2 workers)
mkdocs build --strict		ok
Renovate config validator		ok

Also: bun scripts/screenshots.mjs against bun --bun vite preview took all 12 pictures (into a temp folder, nothing committed).

Not verified

• Cargo fmt/clippy/test and the Tauri app build (bun run tauri dev/build) were not run (no WebKitGTK here); bun run tauri --version works.
• just itself is not installed here; the recipes' commands were run directly.
• WebKit project of Playwright (CI only) and the workflows themselves: CI on this PR will show.

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Generated by Claude Code

[firsttris]

TDD review: no proven findings

I reviewed the migration and tried to prove every suspicion with a test or a run. None turned red, so there is nothing to fix in the PR itself.

Checked (all green):

• Bump workflow: ran the Python step of firsttris/workflows bump-version.yml (version-file: Cargo.toml, extra-files: app/package.json, patch) on a copy of the branch. Result 0.1.8 → 0.1.9: Cargo.toml, Cargo.lock, app/package.json; the root package in bun.lock carries no version, so the lock stays as it is, and bun install --frozen-lockfile still passes afterwards.
• Renovate regex: "packageManager": "bun@(?<currentValue>\d+\.\d+\.\d+)" matches app/package.json (currentValue: 1.4.4), and managerFilePatterns matches app/package.json.
• Release on macOS: bun.lock contains the darwin arm64/x64 binaries of @tauri-apps/cli, rolldown, lightningcss, @tailwindcss/oxide, Biome and oxc-minify, so bun install --frozen-lockfile on macos-26 has what bun run tauri build --target universal-apple-darwin needs.
• Without Node on PATH (the toolbox no longer installs nodejs): bun run tauri --version (tauri-cli 2.12.4), bun run build, bun run lint and bun run coverage (147 tests, thresholds met) all pass. Bun stands in for the node shebangs.
• scripts/screenshots.sh with Playwright's Chromium: build, vite preview on 4317, the bun -e fetch probe (exit 1 without a server, 0 with one) and bun scripts/screenshots.mjs all ran through, and every picture was taken. kill $server also stops the vite child that bun --bun vite starts, so the trap leaves no server running.
• Workflow snippets: the node -p "require('./package.json').packageManager.split('@')[1]" in ci.yml (cwd app) and the folded install input of screenshots.yml (from the repo root) both give 1.4.4; install and command are separate steps in the reusable workflow, so the cd app does not affect bash scripts/screenshots.sh.
• bunx --package <pkg> <bin> (the validator hint in renovate.json5) is accepted by Bun 1.4.4.

Dropped (no failing test):

• Renovate's npm manager already extracts packageManager: bun@… itself (extracts bun packageManager in renovate's lib/modules/manager/npm/extract/index.spec.ts), so the custom regex manager reports the same dependency a second time. Both land in the same "Bun" group and branch. I could not show a failure without a Renovate run, so this is only a note.
• packaging/toolbox.sh and the Debian instructions install the newest Bun (curl … | bash), not the packageManager version. No failure could be shown.

Merge conflict: main's lock file maintenance (#13) changed app/pnpm-lock.yaml, which this branch deletes. I merged origin/main and kept the file deleted (376527c).

Checks on the merged branch (376527c): Biome, tsc -b, Vitest with coverage (147 passed, 96.68 % lines) and Playwright on the mock backend in Chromium (69 passed, 1 skipped) are green.

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Generated by Claude Code

[firsttris]

TDD-Review abgeschlossen: keine belegten Findings; main ohne Force-Push eingemergt (376527c). CI grün: Frontend, Playwright E2E, Rust Linux/macOS, Coverage. Merge per Squash.

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Generated by Claude Code