tui: hide title in hexai-tmux-action menu to save space

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-Comprehensive plan: integrate Helix + tmux flow into hexai-tmux-action
-
-Summary of current setup
-- Helix keybinding pipes selection to the tmux action command.
-- The tmux action writes stdin to a temp file, opens a tmux split-pane, runs `hexai-tmux-action -infile <input> -outfile <reply>.tmp`, then atomically renames to `<reply>` and prints the reply back to Helix.
-- This works but requires shell scripts and out-of-band temp files.
-
-Goal
-- Helix should call hexai-tmux-action directly: `:pipe hexai-tmux-action`.
-- hexai-tmux-action itself handles: reading stdin; presenting TUI in a tmux pane; executing the chosen action; printing the result to stdout for Helix to apply.
-- Consolidate all tmux logic in a reusable `internal/tmux` package for future features.
-
-Proposed CLI/UX
-- Default (auto):
-  - If running in an interactive TTY, run TUI inline and print the result to stdout.
-  - If stdin/stdout are pipes (Helix `:pipe`) and a tmux session is available, spawn a temporary tmux pane to render the TUI, then return the final output on stdout.
-  - If tmux is not available and no TTY is present, fall back to a sensible non-interactive mode: echo input or use instruction-based rewrite if an inline instruction is detected.
-- Flags (public):
-  - `-tmux` (bool, default: auto): force enabling tmux-pane mode.
-  - `-no-tmux` (bool): force disabling tmux-pane mode even if available.
-  - `-infile`, `-outfile`: keep for compatibility/testing, but not needed for Helix.
-- Flags (internal/private; hidden in help):
-  - `-ui-child` (bool): internal child mode that assumes `-infile` and `-outfile` and runs the interactive TUI on the attached TTY, writing final output to outfile.
-  - `-tmux-target` (string, optional): tmux target pane/window (advanced users).
-  - `-tmux-split` (enum: `v|h`, default `v`): split orientation.
-
-High-level design
-1) IO orchestration (parent process)
-   - Determine whether to show TUI inline or via tmux based on TTY detection and `-tmux`/`-no-tmux`.
-   - Inline path: run current `hexaiaction.Run(ctx, in, out, err)` (unchanged behavior) and exit.
-  - Tmux path: write stdin to a secure temp file, spawn a tmux split-pane that executes a `hexai-tmux-action -ui-child -infile <in> -outfile <out>.tmp`, wait for completion (by process exit and/or file rename), then print `<out>` to stdout.
-
-2) Child/TUI execution (`-ui-child`)
-   - Read from `-infile`, parse input (diagnostics + selection), construct LLM client, show Bubble Tea menu, run selected action, write result to `-outfile.tmp`, fsync, rename to `-outfile`.
-   - On error, write a human-readable message to stderr and a minimal fallback to outfile (e.g., echo selection) to avoid blocking Helix.
-
-3) Tmux integration package (`internal/tmux`)
-   - Responsibilities:
-     - Detect availability: binary present and inside a tmux session (`$TMUX` set) or a viable target.
-     - Run commands in a new split pane and return control immediately or after completion.
-     - Small helpers for file-based rendezvous (optional), e.g., `WaitForFile(path, timeout)`.
-   - Minimal API (initial):
-     - `func Available() bool`
-     - `type SplitOpts struct { Target string; Vertical bool; Percent int }`
-     - `func SplitRun(opts SplitOpts, argv []string) error` — runs `tmux split-window ... <argv>` and returns once tmux has launched the child process.
-     - `func HasBinary() bool` and `func InSession() bool` (if we want finer checks).
-   - Implementation details:
-     - Shell out to `tmux` (no lib dep). Build command like: `tmux split-window -v -p 33 "<cmd>"`.
-     - Quote/escape argv safely. Prefer `exec.Command` for the child in a shell wrapper, or join argv for `tmux`’s command string.
-     - Avoid writing to `~/.hx-*`; use `os.CreateTemp("", "hexai-tmux-action-*" )` under `$TMPDIR`.
-
-4) hexaiaction refactor (internal package)
-   - Separate concerns to keep functions small/testable:
-     - New function `ChooseAction(ctx, stdin, stderr) (ActionKind, InputParts, error)` that parses input and (conditionally) runs TUI.
-     - Existing action runners remain unchanged (rewrite, document, diagnostics, gotest).
-     - Keep `Run` as a thin orchestrator that assumes interactive mode; the parent (cmd) decides inline vs tmux/child.
-   - Ensure unit-testable seams: parse, instruction extraction, action execution already have tests; add tests for new branching logic where possible without tmux.
-
-5) Robustness and UX details
-   - TTY detection: use `golang.org/x/term` or a small `isatty` helper to decide inline vs tmux.
-   - Timeouts: child actions already use short timeouts; parent wait for outfile should have a reasonable deadline (e.g., 60s) to avoid hanging Helix.
-   - Atomic writes: write to `outfile.tmp`, `Sync`, then `Rename` for a clear completion signal.
-   - Cleanup: always remove temp files (defer and signal handling for SIGINT/SIGTERM).
-   - Logging: log to stderr with clear `hexai-tmux-action` prefixes; keep stdout clean for Helix’s `:pipe`.
-
-Helix configuration after change
-- Replace the current keybinding pipeline with a single call:
-  - `C-a = ":pipe hexai-tmux-action"`
-
-Migration plan
-1) Implement tmux package and integrate auto-mode in `cmd/hexai-tmux-action/main.go`.
-2) Keep legacy flags (`-infile`, `-outfile`) for compatibility and tests.
-3) Update README and docs to show new Helix keybinding and describe flags.
-4) Mark shell scripts (`llminputs/ai`, `llminputs/hx.hexai-action-prompt`) as deprecated in repo notes; retain them temporarily.
-5) After a stabilization period, remove the scripts (or move to `scripts/legacy/`).
-
-Testing plan
-- Unit tests:
-  - `internal/tmux`: mock `exec.Command` via a small command-runner interface; verify command assembly and availability checks.
-  - `internal/hexaiaction`: tests for tmux split orchestration and child flow.
-  - hexaiaction: existing tests continue to pass; add tests for non-interactive fallback behavior when no TTY.
-- Integration tests (manual or scripted):
-  - Run under tmux: verify a pane opens, TUI choice is applied, stdout contains result.
-  - Run outside tmux: verify inline TUI works in terminal; verify fallback behavior under `:pipe` without tmux.
- - Coverage target: ensure at least 85% unit test coverage for all new code paths added in this integration (verify with `go test -cover ./...` and per-package `-coverprofile`).
-
-Edge cases and mitigations
-- No tmux, no TTY: skip TUI; if inline instruction detected (`;...;`, `// ...`, etc.), run rewrite; else echo selection.
-- tmux available but spawning fails: warn on stderr and fall back to non-interactive mode.
-- Large inputs: spill to temp files; ensure temp dir has space; surface errors clearly.
-- Windows: tmux mode auto-disables; inline mode continues to work.
-
-Implementation steps (incremental)
-1) Add `internal/tmux` with `Available`, `SplitRun`, and helpers.
-2) Wire flags (`-ui-child`, `-tmux-target`, `-tmux-split`, `-tmux-percent`).
-3) Parent flow: detect mode, manage temp files, spawn child via tmux when selected, wait/print result.
-4) Child flow: reuse existing `hexaiaction.Run` to keep logic centralized; ensure outfile atomic write.
-5) Docs: update README with new Helix config and flags.
-6) Optional: add `-tmux-target`/`-tmux-split` for power users.
-
-Notes on code organization
-- Place all tmux-related code under `internal/tmux` and keep functions well under 50 lines.
-- Keep command entrypoint (`cmd/hexai-tmux-action/main.go`) small and focused on wiring/mode selection.
-- Avoid duplication across `hexaiaction` and `tmux`; IO/file and action logic remain in `hexaiaction`.
-
-Outcome
-- One-step Helix integration (`:pipe hexai-tmux-action`).
-- No helper scripts required; cross-platform friendly with graceful fallbacks.
-- Reusable tmux utilities for future features.
-
-Progress
-- [x] Add `internal/tmux` with `Available`, `SplitRun`, quoting helpers.
-- [x] Wire flags in tmux action: `-ui-child`, `-tmux-target`, `-tmux-split`, `-tmux-percent`.
-- [x] Parent tmux orchestration: write stdin to temp, split tmux, wait for outfile, print to stdout.
-- [x] Child mode: atomic `outfile.tmp` write and rename, with error echo fallback.
-- [x] Unit tests for `internal/tmux` and tmux orchestration in action (validate locally; target ≥85% coverage for new code).
-- [x] Update README/docs for new Helix keybinding and flags.
-- [ ] Delete legacy helper scripts (`llminputs/ai`, `llminputs/hx.hexai-action-prompt`) when ready; no deprecation notice.
-- [x] Ran coverage locally. Notes:
-  - `mage coverage` now passes (HTML at docs/coverage.html). Total cross-package coverage ≈ 84%.
-  - New package `internal/tmux` is ≥85% covered. The action entrypoint package sits ~69% overall; newly added helper paths are covered (openIO, runChild, runInTmuxParent, etc.). The `main()` remains intentionally untested.