Change default gesture swipes to desktop switching

[klovinad]

Summary

Split out from #94 as requested.

This PR changes the default horizontal gesture-button swipes from browser tab switching to desktop/space switching:

• Left swipe → Previous Desktop
• Right swipe → Next Desktop

Why

AprilNEA asked to keep this UX decision separate from the wheel-scroll settings work, so each change can be reviewed and reverted independently.

The wheel-scroll settings remain in #94. This PR contains only the default gesture remap.

Verification

• cargo fmt --all
• git diff --check

cargo test -p openlogi-core default_gesture_binding --lib was attempted locally, but dependency fetching hung while updating git dependencies before compilation.

[greptile-apps]

Greptile Summary

This PR changes the default left/right swipe gesture actions from tab navigation (PrevTab/NextTab) to virtual desktop switching (PreviousDesktop/NextDesktop). The change applies only to first-run defaults; persisted user configurations are unaffected.

• The direction mapping (Left → PreviousDesktop, Right → NextDesktop) aligns with the macOS spatial metaphor for Spaces, making it intuitive out of the box.
• All existing tests in config.rs compare against default_gesture_binding(dir) rather than hardcoded action variants, so they remain valid after this change with no updates required.

Confidence Score: 5/5

Safe to merge — the change is a two-line update to first-run defaults with no impact on saved user configurations.

The only touched code is the default_gesture_binding function, which seeds the UI picker on first run. Existing tests in config.rs compare results against default_gesture_binding(dir) rather than hardcoded action variants, so they stay correct automatically. The new mapping (Left → PreviousDesktop, Right → NextDesktop) matches the macOS Spaces spatial layout and is more broadly useful as a default than browser-tab navigation.

No files require special attention.

Important Files Changed

Filename	Overview
crates/openlogi-core/src/binding.rs	Two-line default change: left/right swipe gestures now map to PreviousDesktop/NextDesktop instead of PrevTab/NextTab; both Action variants already existed and are tested.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    G[Gesture Input] --> D{Direction}
    D -->|Up| MC[MissionControl]
    D -->|Down| SD[ShowDesktop]
    D -->|Left| PD[PreviousDesktop ✨ changed]
    D -->|Right| ND[NextDesktop ✨ changed]
    D -->|Click| AE[AppExposé]

    style PD fill:#d4edda,stroke:#28a745
    style ND fill:#d4edda,stroke:#28a745

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