fix(inject): match Lock Screen by character, not physical key position

[4ni1ak]

Summary

• The Lock Screen action never worked on non-QWERTY layouts (reported on French AZERTY): it typed the wrong character and macOS ignored the chord.

Changes

• crates/openlogi-inject/src/inject/macos.rs: macOS's Lock Screen shortcut (Ctrl+Cmd+Q) is matched by the resolved character, not the physical key position — confirmed by the reporter's own CGEventTap trace: posting the ANSI-QWERTY position of Q (kVK_ANSI_Q = 0x0C) types A on AZERTY and does nothing, while posting the ANSI-QWERTY position of A (kVK_ANSI_A = 0x00, which types Q on AZERTY) successfully locks. This is unlike Screenshot's Cmd+Shift+3, which macOS binds to the physical digit-row position regardless of layout. Added post_key_for_char, which sets the event's unicode payload directly via CGEventKeyboardSetUnicodeString (the same technique already used by post_unicode for TypeText) instead of relying on a fixed virtual keycode, and switched NativeAction::LockScreen to it.

Testing

• cargo check -p openlogi-inject --target x86_64-apple-darwin
• cargo clippy -p openlogi-inject --target x86_64-apple-darwin --all-targets -- -D warnings
• cargo clippy --workspace --all-targets -- -D warnings (full tier; Linux host, macOS code only cross-checked above)
• cargo test --workspace
• RUSTDOCFLAGS="-D warnings" cargo doc --workspace --no-deps --document-private-items --exclude openlogi-ui --exclude openlogi-desktop --exclude openlogi-overlay --exclude openlogi-agent
• Not runtime-tested on macOS hardware (no linker available on this Linux host for the macOS target) — the fix follows the exact mechanism the reporter's own diagnostics point to and reuses an existing, working layout-independent technique already in this file, but real-hardware verification on an AZERTY Mac is still needed.

Fixes #1430

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no concrete correctness, security, or repository-rule violations identified.

Summary

This PR updates the macOS Lock Screen action to identify its Q key by resolved character rather than a fixed ANSI/QWERTY key position.

• Adds post_key_for_char, which attaches a Unicode payload to synthesized key-down and key-up events.
• Uses the new helper for Ctrl+Cmd+Q while leaving position-based shortcuts unchanged.

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