fix(linux): remove libfuse2 dependency from AppImages

[satwiksharma01]

Summary

Linux AppImages use electron-builder's legacy runtime by default, which requires libfuse2 on the host. Select the supported appimage toolset 1.0.3 in electron-builder.json5 to use its statically linked runtime.

The existing electron-builder 26.15.3 dependency supports this option. Its static-runtime packaging path still appends the embedded blockmap and generates update metadata.

Related issue

Fixes #736

Type of change

• Bug fix

Release impact

• Patch

Desktop impact

• Linux
• Installer / packaging

Screenshots / video

No visual change.

Testing

• Validated the configuration with the installed electron-builder 26.15.3 schema.
• Both application and test TypeScript checks passed with Node 22.22.1.
• Repository lint passed with 26 existing warnings; documentation checks passed.
• Full unit suite passed: 307 files, 4,298 tests passed, 5 skipped.
• Verified the official toolset archive's SHA256 against the checksum pinned by electron-builder.
• Verified that its x64 runtime is static PIE with no DT_NEEDED libraries.
• Built a disposable zstd AppImage with that runtime and the toolset's mksquashfs. It mounted through FUSE and launched successfully on WSL Ubuntu 26.04 with no libfuse2 or libfuse2t64 installed.

The runtime smoke test uses a small shell application; a complete packaged OpenScreen desktop launch has not been tested. The supported toolset also uses zstd for normal compression and retains the launcher's user-namespace sandbox fallback.

Summary by CodeRabbit

• Chores
  • No user-facing changes are included in this update. App features, behavior, and workflows remain unchanged. The update is limited to release packaging and does not affect how the app looks or works. No new capabilities or changes to existing functionality are included.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 13e01f2a-bff1-4fab-9a4f-e90ef3679196

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📥 Commits

Reviewing files that changed from the base of the PR and between 870196c and 8c55f57.

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📒 Files selected for processing (1)

• electron-builder.json5

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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The build configuration pins the AppImage toolset to version 1.0.3.

Changes

AppImage Toolset

Layer / File(s)	Summary
Pin the AppImage toolset version electron-builder.json5	The configuration sets the AppImage toolset version to 1.0.3.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Bug fix

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Merge Risk: ⚪ Minimal · up to 8c55f

The release workflow selects the pinned AppImage toolset, and no actionable merge-blocking risk remains. The packaged runtime artifact was not independently verified in this inspection.

Pre-merge checks | 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: removing the libfuse2 dependency from Linux AppImages.
Description check		The description follows the repository template. It includes the summary, issue reference, change type, release impact, platform impact, visual-change note, and detailed testing results.
Linked Issues check		Issue #736 requires removing the AppImage host dependency on libfuse2. The PR adds toolsets.appimage: "1.0.3" in electron-builder.json5. The reported validation confirms that the selected x64 ru…
Out of Scope Changes check		The whole-PR diff contains only the appimage toolset configuration and its explanatory comment in electron-builder.json5. This change directly supports issue #736 and does not show unrelated imple…
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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[EtienneLescot]

Marking ready: we're taking the static runtime (no libfuse2). The update-info hook from #1072 targets .upd_info in both runtimes and passed on a dispatched build of main.

[EtienneLescot]

Reviewed: static AppImage runtime (toolset 1.0.3), no libfuse2 on the host; update info still embedded. Thanks @satwiksharma01!