fix: use correct JSR specifier for @meshtastic/protobufs

[danditomaso]

Summary

• Fix the @meshtastic/protobufs dependency specifier to use the full JSR format (jsr:@meshtastic/protobufs@^2.7.18) instead of the shorthand
• Pin pnpm version to 10.17.0 in CI workflows for reproducible builds
• Remove unused .npmrc (JSR registry config no longer needed with correct specifier)

Test plan

• Verify pnpm install resolves correctly
• Verify CI builds pass with pinned pnpm version

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[Copilot]

Pull request overview

Updates the repo’s dependency and CI configuration to correctly consume @meshtastic/protobufs from JSR and make pnpm installs more reproducible in CI.

Changes:

• Fix @meshtastic/protobufs to use the full JSR specifier format (jsr:@meshtastic/protobufs@^2.7.18).
• Pin pnpm to 10.17.0 in PR and main-branch CI workflows.
• Remove the root .npmrc JSR registry override.

Reviewed changes

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

File	Description
package.json	Corrects the JSR dependency specifier for @meshtastic/protobufs.
.npmrc	Removes the JSR registry config entry now deemed unnecessary.
.github/workflows/pr.yml	Pins pnpm version to 10.17.0 for PR CI reproducibility.
.github/workflows/ci.yml	Pins pnpm version to 10.17.0 for main branch CI reproducibility.

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