refactor: icon compatibility with macos tahoe

[cpvalente]

Adds new icon format for mac, as mentioned in #1999
https://www.electron.build/icons.html

[coderabbitai]

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[Copilot]

Pull request overview

This PR updates the Electron packaging configuration/assets to improve macOS (Tahoe) icon compatibility, alongside the dependency/lockfile changes required to support the new build setup.

Changes:

• Bump electron-builder to 26.8.1 and refresh pnpm-lock.yaml accordingly.
• Switch macOS build icon configuration from icon.icns to the new ontime.icon bundle.
• Add the apps/electron/src/assets/ontime.icon/icon.json asset metadata (for the new icon bundle).

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated 1 comment.

File	Description
pnpm-lock.yaml	Lockfile refresh to support the electron-builder update and updated transitive dependency graph.
apps/electron/src/assets/ontime.icon/icon.json	Adds the new .icon bundle metadata referenced by the Electron build config.
apps/electron/package.json	Updates electron-builder version and points macOS build icon to ontime.icon.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Copilot]

In the apps/client importer, Vite/Vitest are now resolved against @types/node@25.4.0, even though the workspace catalog pins @types/node to 22.15.26 (and the repo engine is Node ~22). If the intent is to keep Node typings aligned across the monorepo, consider adding an explicit @types/node: catalog: devDependency to apps/client or using a pnpm override to prevent pulling in a newer @types/node via transitive/optional deps.