CI/CD: no need anymore to install bun manually on Windows ARM

[agarny]

No description provided.

[Copilot]

Pull request overview

This PR removes the manual bun installation workaround for Windows ARM in the CI and CD workflows, as oven-sh/setup-bun@v2 now natively supports Windows ARM. It also includes a version bump and minor dependency updates.

Changes:

• CI/CD workflow simplification: the manual curl/unzip workaround for installing bun on Windows ARM is replaced with the unified oven-sh/setup-bun@v2 action across all platforms.
• Version bump from 0.20260304.2 to 0.20260305.0 in both package.json files (consistent with the project's <major>.<YYYYMMDD>.<patch> versioning convention).
• Dependency updates: electron bumped from ^40.6.1 to ^40.7.0 and tar from ^7.5.9 to ^7.5.10.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/ci.yml	Removes Windows ARM bun workaround; all platforms now use oven-sh/setup-bun@v2
.github/workflows/cd.yml	Same workflow simplification as ci.yml
package.json	Version bump and dependency updates for electron and tar
src/renderer/package.json	Version bump to stay in sync with the root package.json
bun.lock	Lock file updated to reflect the new electron and tar versions

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

You can also share your feedback on Copilot code review. Take the survey.