Use static AppImage runtime for Linux packaging

[Copilot]

Fixes #3434.

Neuron's Linux AppImage currently uses the legacy AppImage runtime, which tries to load libfuse.so.2 and fails on fresh distributions that provide FUSE 3 instead.

Changes

• Upgrade electron-builder to 26.15.7.
• Select AppImage toolset 1.0.3, whose runtime is statically linked and does not require host libfuse2.
• Move Windows signing options under signtoolOptions for the newer builder schema.
• Keep the repository's Node 20 baseline by resolving @electron/rebuild to 3.7.2.
• Add a structural config test for the AppImage target and toolset selection.

Validation

• yarn build
• Linux test packaging with electron-builder 26.15.7
• Generated AppImage reports static-pie linked
• Generated AppImage contains no libfuse.so.2 reference
• Generated AppImage mounts successfully on a FUSE 3 host
• Extracted AppRun uses the corrected LD_LIBRARY_PATH expansion
• Focused electron-builder config test passes

Flatpak distribution and unrelated runtime libraries such as libnss3 and libasound remain outside this AppImage FUSE fix.

[eval-exec]

@chenyukang I think this PR is ready to merge. After this, we can prepare to create a new neuron Release:

Ref: #3500

[Copilot]

Pull request overview

Updates Neuron’s Linux AppImage packaging to use a newer electron-builder toolchain and explicitly select the AppImage toolset with a statically linked runtime, addressing failures on FUSE 3-only hosts (issue #3434).

Changes:

• Upgraded electron-builder to 26.15.7 and updated the lockfile accordingly.
• Configured electron-builder.yml to use AppImage toolset 1.0.3 (static runtime) and adjusted Windows signing config nesting.
• Added a Jest config-structure test for the AppImage target/toolset selection (and added yaml to support parsing).

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
yarn.lock	Dependency graph updates from upgrading electron-builder and related packages.
packages/neuron-wallet/tests/config/electron-builder.test.ts	Adds a structural test asserting AppImage target + toolset selection.
packages/neuron-wallet/package.json	Bumps electron-builder; adds yaml for the new test.
packages/neuron-wallet/electron-builder.yml	Selects AppImage toolset 1.0.3; moves Windows signing options under signtoolOptions.
package.json	Adds a resolution pin for @electron/rebuild to keep Node 20 baseline compatibility.

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[Copilot]

Pull request overview

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