both focus_direction and swap_direction now check if the focused
window's edge touches the monitor boundary before consulting
find_adjacent. prevents the BSP spiral from trapping navigation
at the edge — if a window is flush with the right edge of the
monitor, pressing right crosses to the next monitor instead of
spiraling deeper into the BSP tree.

reverts tarmac and ers to pre-session state (d422773 / 6acfaa6).
all sprint 14/15 features (IPC enrichment, Lua callbacks, tray,
settings window, floating window z-order changes) removed to
restore stability. these features destabilized tiling layout,
border rendering, and multi-monitor workspace management.

reverts all floating window level/ordering changes from the
debugging session: K_CG_MODAL_WINDOW_LEVEL usage in state.rs,
enforce_floating_if_needed polling, stripped activate_app paths,
and ers layer filter changes. restores state.rs and ers to the
last stable versions (post CI-fix, pre floating-window experiments).

keeps: sprint 14/15 features (IPC enrichment, Lua callbacks, tray,
settings window, config write-back), CI fix, ers click-through fix,
ers binary path resolution, border.rs to_hex pub.

- keyboard input now follows mouse focus (activate_app routes input)
- ers gets EVENT_FRONT_CHANGE for border color updates
- AXRaise still skipped to prevent tiled window z-order change
- enforce_floating_levels called immediately after activation and
  again after recording focus (double reassertion)
- 50ms poll provides continuous third layer of enforcement
- floating windows at level 8 + SLSOrderWindow should survive
  the async reordering from activate_app

- tarmac now finds ers next to its own binary before falling back to
  PATH, ensuring cargo run uses the matching debug/release build
- ers queries target window level via main connection (not per-border
  connection) for reliable cross-process level detection
- border overlays placed at target_level + 1 offset

activate_app reorders windows asynchronously, overriding the CGS
level we set. fix by:
- adding SLSOrderWindow binding to force z-order after level set
- enforce_floating_levels now calls order_window_front on every
  floating window, not just set_window_level
- polling timer calls enforce_floating_if_needed every 50ms to
  counter async macOS reordering
- lightweight guard skips enforcement when no floating windows exist

when focusing a tiled window while floating windows exist on the
workspace, skip AXRaise so the tiled window stays visually behind
floating windows. activate_app is still called for keyboard input
routing, but the visual z-order is preserved. floating windows get
full activation (AXRaise + activate_app) as before.

also expand enforce_floating_levels to cover all visible workspaces
across monitors and active special/scratchpad workspaces.

- add submodules: true to actions/checkout (fixes ers not found)
- scope clippy to -p tarmac -p tarmacctl (avoids ers pre-existing warnings)
- scope fmt check to tarmac + tarmacctl (ers has own formatting)
- allow wrong_self_convention and too_many_arguments in CI clippy
- cargo fmt all tarmac/tarmacctl source files

- update_lua_setting: regex-replace gar.set("key", ...) lines in config
- preserves all comments, bindings, rules, and custom Lua code
- all General tab controls write to config on change: gaps, bar height,
  border width/radius/colors, FFM, mouse-follows-focus, mod key
- lua_number/lua_string helpers for formatting Lua literals
- 3 unit tests for write-back (number, string, preservation)

- NSSegmentedControl tab bar: General, Keybindings, Rules, About
- content view swaps on tab selection via SettingsHandler
- Keybindings tab: scrollable monospaced text view of all bindings
- Rules tab: scrollable text view of window rules (match -> action)
- About tab: version, description, GitHub link, config path
- populate keybinds/rules from LuaConfig in snapshot builder
- enable NSSegmentedControl, NSScrollView, NSTextView features

- NSWindow with sliders for gaps, bar height, border width/radius
- NSColorWell for focused/unfocused border colors
- NSButton checkboxes for FFM and mouse-follows-focus
- NSPopUpButton dropdown for modifier key selection
- SettingsHandler ObjC class dispatches control actions via mpsc
- changes apply immediately (apply_layout + update_borders)
- "Settings..." menu item in tray dropdown
- value labels update in real-time as sliders move
- enable NSSlider, NSSwitch, NSTextField, NSColorWell, NSPopUpButton
  features in objc2-app-kit

- NSStatusItem with template image (airplane landing on runway)
- button title shows active workspace ID
- dropdown menu lists non-empty workspaces with window counts
- checkmark on active workspace, click to switch
- Reload Config and Quit actions in menu
- TrayHandler ObjC class dispatches menu actions via mpsc channel
- polling timer updates tray state and processes menu actions
- enable NSStatusBar, NSMenu, NSMenuItem, NSImage in objc2-app-kit

- fire_event_with_data: converts serde_json::Value to Lua tables for
  structured callback args (window_focused, window_created, window_closed,
  layout_changed, monitor_changed)
- workspace_changed keeps (old, new) string args for sketchybar compat
- json_to_lua recursive converter handles all JSON types
- Lua data builders on WmState: window_focus_data, window_created_data,
  layout_changed_data, monitor_changed_data
- all event sites (hotkeys, IPC commands, FFM, click-to-focus, window
  create/close) now fire both IPC publish and Lua callback

- WorkspaceChanged: full workspace list with window counts and monitor assignments
- WindowFocused: add title, app_bundle, workspace fields
- WindowCreated: add title, app_bundle, workspace fields
- WindowClosed: add app_name
- MonitorChanged: add monitor_count, focused_workspace
- LayoutChanged: add window_count, layout_type
- Publish events from all code paths: FFM, click-to-focus, IPC commands,
  hotkey-driven swap/resize/equalize/toggle-float/move operations
- Add workspace_snapshot, window_focused_event, workspace_changed_event,
  layout_changed_event builders to WmState
- Add serde rename for consistent snake_case event names in JSON