Fix kanban quick input to send literal text via tmux

[bborn]

Summary

• Bug found: sendTextToExecutor used SendKeyToPane which passes user text to tmux send-keys without the -l (literal) flag. If user input matched a tmux key name (e.g. "Enter", "Escape", "Space", "Tab"), it would be interpreted as a key press instead of literal text.
• Fix: Added SendLiteralTextToPane that sends text with -l flag (ensuring literal interpretation), then sends Enter as a separate key press.
• Tests: Added TestQuickInput_EnterWithTextSendsAndUnfocuses and TestQuickInput_EnterWithTextNoSelectedTask to cover the send-text-on-enter path and the nil-task edge case.

Audit findings

The kanban quick input function mostly works but had one correctness bug:

Area	Status	Notes
Tab activation guard	OK	Only activates when task needs input
Esc/empty-enter unfocus	OK	Properly clears state
View routing	OK	Intercepts all msg types when focused
Prompt rendering	OK	Shows input bar with hints
State cleanup on send	OK	Clears value, blurs, unfocuses
Log resolution	OK	"Replied from kanban" matches resolver
tmux text sending	Fixed	Was missing -l flag for literal text

Test plan

• All existing QuickInput tests pass
• New tests for enter-with-text and nil-task cases pass
• Full test suite passes (ui, executor, db, config)
• Build compiles cleanly

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