This PR groups the TUI fixes that restore macOS Terminal usability and clean up the theme/composer regressions:
- copy transcript selections on macOS drag-release so Terminal.app users can copy while mouse tracking is enabled
- copy composer selections on macOS drag-release; composer selection is internal to TextInput and does not use the global Ink selection bus
- keep IDE Cmd+C forwarding setup macOS-only, and make keybinding conflict checks respect simple when-clause overlap/negation
- force truecolor before chalk initializes (unless NO_COLOR / FORCE_COLOR / HERMES_TUI_TRUECOLOR opt-outs apply) so the default banner keeps its gold/amber/bronze gradient in Terminal.app
- move TUI surfaces onto semantic theme tokens and preserve skin prompt symbols as bare tokens with renderer-owned spacing
- render focused placeholders as dim hint text in TTY mode instead of inverse/selected-looking synthetic cursor text
- Fix critical regression: on Linux, Ctrl+C could not interrupt/clear/exit
because isAction(key,'c') shadowed the isCtrl block (both resolve to k.ctrl
on non-macOS). Restructured: isAction block now falls through to interrupt
logic on non-macOS when no selection exists.
- Remove double pbcopy: ink's copySelection() already calls setClipboard()
which handles pbcopy+tmux+OSC52. The extra writeClipboardText call in
useInputHandlers copySelection() was firing pbcopy a second time.
- Remove allowClipboardHotkeys prop from TextInput — every caller passed
isMac, and TextInput already imports isMac. Eliminated prop-drilling
through appLayout, maskedPrompt, and prompts.
- Remove dead code: the isCtrl copy paths (lines 277-288) were unreachable
on any platform after the isAction block changes.
- Simplify textInput Cmd+C: use writeClipboardText directly without the
redundant OSC52 fallback (this path is macOS-only where pbcopy works).
