fix: ci, use app icon in native builds

[pszemraj]

Hardens the release-gui pipeline to fix the two release blockers and improve resilience against runner/tooling drift.

What changed

• Updated .github/workflows/release-gui.yml
  • Added weekly schedule trigger (current_ref dry-run mode).
  • Pinned Windows runner to windows-2022.
  • Replaced WiX install with a capability check/install step (Ensure WiX Toolset (major 3)).
  • Fixed Windows PowerShell env parsing for ProgramFiles(x86) (post-iteration fix).
  • Added --locked to release/smoke build commands.
  • Hardened Linux AppImage verification:
    • capture --appimage-version with 2>&1
    • validate extracted payload (--appimage-extract, expected binary + .desktop).
• Updated .github/scripts/release_gui_prepare.py
  • WiX discovery now evaluates candidates and selects matching expected major.
• Updated .github/scripts/release_gui_collect.py
  • Artifact collection now tolerates extension casing variants:
    • .AppImage/.appimage
    • .msi/.MSI
    • .dmg/.DMG
• Updated .github/scripts/validate_workflow.py
  • Release matrix expectation now uses windows-2022.

Why

• Fixes Windows failure caused by WiX version conflict on hosted runners.
• Fixes Linux false negative where AppImage runtime version is emitted on stderr.
• Reduces fragility from runner image/toolchain churn.

Validation

• Dry-run release workflow (failed first, identified and fixed PowerShell parsing bug):
  • Failed: https://github.com/pszemraj/localpaste.rs/actions/runs/22388176412
• Dry-run release workflow after fix (successful):
  • Passed: https://github.com/pszemraj/localpaste.rs/actions/runs/22388596479
• Both runs used workflow_dispatch with:
  • source_mode=current_ref
  • dry_run=true
• publish job was skipped (no deployment/artifact release publishing).

Notes

• This PR includes full CI hardening scope plus one follow-up Windows script fix discovered during live CI execution.

[pszemraj]

@codex review

[chatgpt-codex-connector]

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Reviewed commit: 8ac96ef8fa

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[pszemraj]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. You're on a roll.

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