Use prominent Enter icon button and suppress mobile keyboard for special-key shortcuts

[guysmoilov]

Problem

The current Enter action is low-visibility, and tapping shortcut keys can trigger the mobile keyboard unnecessarily. This causes accidental focus shifts and friction in command entry workflows.

Proposal

1. Replace the text Enter button with a clear icon button and prominent accent color.
2. For shortcut-key buttons, send key events without focusing text inputs so the mobile keyboard does not open.

Key List (Requested)

• Arrow keys
• Home
• End
• Esc
• Tab
• Ctrl+C

Recommended Additional Keys

• PageUp
• PageDown
• Ctrl+D

Keep / Remove Guidance

• Keep: arrows, Esc, Tab, Ctrl+C (high-frequency in tmux/CLI)
• Keep: Home/End if mapped to terminal cursor navigation as expected
• Optional: PageUp/PageDown if they map to shell/history/terminal behavior reliably
• Optional: Ctrl+D (useful but potentially destructive depending on context)

UX Requirements

• Enter icon button is visually prominent and easy to hit on mobile
• Tapping Enter and shortcut-key buttons does not open the software keyboard
• Buttons remain accessible and responsive in both portrait and landscape

Acceptance Criteria

• Enter text label is replaced with icon-based primary action
• Enter action sends newline correctly
• Shortcut keys send expected control sequences
• Mobile keyboard stays closed when using these non-text buttons
• Tests cover at least one shortcut button path verifying no input-focus side effects