feat: add a GNOME Overview button action

[jannikdonker]

Summary

Adds a new button/gesture action, "GNOME Overview," that opens the GNOME
Shell Activities Overview — a natural fit for the MX Master 3/3S gesture
button. Linux/GNOME-real; a debug-logged no-op on macOS/Windows, and hidden
from every picker unless the session actually reports GNOME.

Changes

• openlogi-core: new Action::GnomeOverview / NativeAction::GnomeOverview
  variant, appended per the append-only stability contract; reuses the
  existing Grid icon so no ActionRingIcon change (and therefore no IPC
  PROTOCOL_VERSION bump) is needed.
• openlogi-inject: Linux taps the bare Super key via uinput
  (press_key(&[], KEY_LEFTMETA)), relying on GNOME Shell's default
  overlay-key behavior — the same primitive already used for LockScreen's
  Super+L fallback. macOS/Windows debug-log a no-op, matching the existing
  precedent for actions with no cross-platform equivalent.
• openlogi-gui: wires the new action into the button picker, gesture
  flyout, keyboard function-row picker, and Actions Ring editor (all share
  the same catalog helpers). Adds a new action_visibility module that
  hides GnomeOverview from all of those catalogs unless
  $XDG_CURRENT_DESKTOP reports a GNOME session — the same variable
  .desktop entries use for OnlyShowIn=GNOME;. An already-persisted
  binding keeps working even when hidden from the picker.
• i18n: adds the "GNOME Overview" key to all 20 locale files; zh-CN
  gets a real translation ("GNOME 概览") since that locale is exhaustively
  checked against the full action catalog.

Testing

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test --workspace
• cargo test -p openlogi-gui i18n (locale parity + zh-CN coverage)
• cargo test -p openlogi-ipc --test wire_format (confirms no wire-format
  change — Action/NativeAction aren't part of the IPC contract)
• RUSTDOCFLAGS="-D warnings" cargo doc -p openlogi-hid -p openlogi-hidpp -p openlogi-hidpp-derive --no-deps --document-private-items
• Not runtime-tested on a live GNOME session (no GNOME desktop available in
  this environment) — the Super-key-tap mechanism and the picker's
  GNOME-only gating should be sanity-checked on real hardware/session before
  merge.

[greptile-apps]

Greptile Summary

Adds a GNOME-specific Overview action that injects a bare Super-key tap on Linux and remains a logged no-op elsewhere.

• Extends the persisted action and native-effect catalogs without changing existing variant names.
• Filters the action from GUI pickers unless the Linux session reports GNOME.
• Wires the action into button, gesture, keyboard, and Actions Ring catalogs.
• Adds the action label across all locale files and platform dispatch matches.

Confidence Score: 5/5

The PR appears safe to merge with no concrete blocking or independently actionable issues identified.

The new action is appended compatibly, reaches exhaustive platform dispatch paths, emits a valid declared Super-key sequence on Linux, and is consistently filtered from unsupported GUI catalogs.

Important Files Changed

Filename	Overview
crates/openlogi-gui/src/action_visibility.rs	Introduces centralized, tested GNOME-session gating for newly offered action choices while leaving persisted bindings intact.
crates/openlogi-gui/src/mouse_model/picker.rs	Applies host visibility filtering to shared button and gesture catalogs and adds the Overview icon mapping.
crates/openlogi-gui/src/components/action_ring_panel/editor.rs	Applies the same host visibility policy to Actions Ring choices.
crates/openlogi-core/src/binding/action.rs	Appends the persisted GnomeOverview action and includes it in the shared catalog.
crates/openlogi-core/src/binding/effect.rs	Maps the new persisted action to its corresponding native effect.
crates/openlogi-inject/src/inject/linux.rs	Implements Overview activation as a complete bare-Super key tap using an already-declared uinput capability.
crates/openlogi-inject/src/inject/macos.rs	Handles the GNOME-specific action as an intentional debug-logged no-op.
crates/openlogi-inject/src/inject/windows.rs	Handles the GNOME-specific action as an intentional debug-logged no-op.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[GNOME session detected] --> B[Overview offered in GUI catalogs]
  B --> C[Persisted Action::GnomeOverview]
  C --> D[NativeAction::GnomeOverview]
  D --> E[Linux uinput]
  E --> F[Bare Super press and release]
  F --> G[GNOME Activities Overview]
  H[Non-GNOME session] --> I[Action hidden from new choices]
  J[macOS or Windows execution] --> K[Debug-logged no-op]

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