fix(installer): respect BIN_DIR for PATH and tmux scripts

[Microdent]

Summary

When users set a custom CODEX_BIN_DIR, the installer and tmux integration previously still hardcoded ~/.local/bin in a few places. This made the installed helper scripts and PATH configuration inconsistent with the configured bin directory.

This PR removes the remaining ~/.local/bin coupling and makes tmux integration fully honor CODEX_BIN_DIR end-to-end.

What changed

• Installer PATH setup now appends the configured BIN_DIR (derived from CODEX_BIN_DIR) instead of ~/.local/bin.
• tmux helper scripts are installed/uninstalled into/from BIN_DIR.
• tmux config no longer hardcodes ~/.local/bin; it uses an install-time placeholder replacement so key bindings point to the correct BIN_DIR.
• ccb-tmux-on.sh no longer assumes helper scripts live in ~/.local/bin; it resolves helper paths relative to its own location.

Why

Customizing CODEX_BIN_DIR should be a supported workflow (e.g., shared tool directories, non-default HOME layouts, container/WSL setups). Hardcoding ~/.local/bin breaks that expectation and causes “installed but not found” behavior in tmux keybindings / status helpers.

Backward compatibility

• Default behavior remains unchanged for users who keep the default CODEX_BIN_DIR (i.e., ~/.local/bin).
• Users with an existing tmux block will have it refreshed by the installer update path.

Testing

• Ran bash -n install.sh and bash -n ccb-tmux-on.sh config/ccb-tmux-off.sh.
• Manual sanity check: verified generated tmux config points to the configured BIN_DIR.

How to verify (manual)

1. Run: CODEX_BIN_DIR=/your/custom/bin CODEX_INSTALL_PREFIX=/your/prefix install.sh install
2. Confirm the helper scripts exist in /your/custom/bin (e.g., ccb-tmux-on.sh, ccb-border.sh, ccb-status.sh).
3. Reload tmux config: tmux source-file ~/.tmux.conf
4. In tmux, use the provided keybindings to toggle CCB theming and confirm no references to ~/.local/bin remain in the active workflow.

Notes

Windows installer paths were reviewed; no analogous ~/.local/bin assumption exists there, so no changes were required.

[Copilot]

Pull request overview

This PR removes hardcoded ~/.local/bin references in the installer and tmux integration, making them respect the user-configured CODEX_BIN_DIR environment variable. This enables users to install helper scripts to custom directories.

Changes:

• Updated PATH configuration to use the configured BIN_DIR instead of hardcoded ~/.local/bin
• Modified tmux helper script installation paths to use BIN_DIR
• Implemented placeholder replacement in tmux config to dynamically inject the correct BIN_DIR path
• Updated ccb-tmux-on.sh to resolve helper script paths relative to its own location

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
install.sh	Updates PATH setup, tmux script installation paths, and implements @CCB_BIN_DIR@ placeholder replacement in tmux config
config/tmux-ccb.conf	Replaces hardcoded paths with @CCB_BIN_DIR@ placeholder and tmux variable references
config/ccb-tmux-on.sh	Resolves helper script paths dynamically relative to script location instead of assuming ~/.local/bin

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[Copilot]

The shell variables $ccb_tmux_conf and $BIN_DIR are directly interpolated into Python single-quoted strings without proper escaping. If BIN_DIR contains single quotes, backslashes, or other special characters, the Python code will have a syntax error.

Consider using proper escaping or passing these values as command-line arguments to Python, or using a different delimiter that won't conflict with path characters.

Suggested change

	"$PYTHON_BIN" -c "
	import sys
	path = '$ccb_tmux_conf'
	bin_dir = '$BIN_DIR'
	CCB_TMUX_CONF="$ccb_tmux_conf" CCB_BIN_DIR="$BIN_DIR" "$PYTHON_BIN" -c "
	import os
	import sys
	path = os.environ.get('CCB_TMUX_CONF')
	bin_dir = os.environ.get('CCB_BIN_DIR', '')

[Copilot]

When Python is not available, the fallback simply cats the config file without replacing the @CCB_BIN_DIR@ placeholders. This means the tmux keybindings at lines 130-131 in the config file will reference the literal string @CCB_BIN_DIR@ instead of the actual bin directory path, causing them to fail.

Consider using sed as a fallback to perform the replacement, which is more universally available than Python.