Add direct keystroke typing for clippings

[MahdiHedhli]

Summary

• add an Option-key alternate menu action that types a selected clipping as keystrokes
• add the T key as the equivalent action in the Flycut bezel
• emit composed Unicode text on a serial queue with explicit Return/Tab handling and a short delay for remote-console reliability
• prevent held modifiers and overlapping typing jobs from changing or duplicating output
• preserve the existing click and Return paste behavior

Motivation

Some VM consoles, remote-management interfaces, and restricted fields do not accept clipboard paste. This provides an explicit fallback without invoking AppleScript or modifying the clipboard.

Validation

• clean Debug build with code signing disabled
• clean Release build with code signing disabled
• Xcode static analysis completed; no analyzer findings point to the new typing path
• git diff --check

Manual runtime validation against a paste-blocked PiKVM/noVNC field is still pending because a locally signed build requires a separate macOS Accessibility grant. The PR is a draft until that check is complete.

I used AI assistance to prepare this change and reviewed the implementation and build results myself.