kiosk: pi-friendly compact mode + chromium 72 fallbacks

- Detect kiosk mode (localhost / ?kiosk=1) and add html.kiosk-mode
- Suppress 3D path-viewer in kiosk mode (Pi 3B too slow)
- Compact 1366x768 layout: 56px header, smaller jog grid, 4-col macros
  2-col status, 540px jog column
- Flex-gap fallbacks for Chromium 72 (header tabs, sys-btn, state-badge,
  ktab, sp-row, etc.) using "> * + *" margin-* rules
- Path-viewer: opaque WebGL canvas, ResizeObserver-gated render loop,
  no first-frame size flash
- Path-viewer renderer cleared properly on component teardown
- W axis row: W- | W+ | Probe XYZ | Probe Z (was W-|HomeW|W+|Probe)
- Running panel only for actual program execution (not jogging)
- Settings sectioned (Display+Units / Probing / G-code+Motion)
- Routed component now keep-alive across tab swaps
- FA4 -> FA6 webfonts

src/svelte-components/src/main.ts

@@ -6,6 +6,7 @@ matchAll.shim();
 import AdminNetworkView from "$components/AdminNetworkView.svelte";
 import SettingsView from "$components/SettingsView.svelte";
 import HelpView from "$components/HelpView.svelte";
+import WAxisSettings from "$components/WAxisSettings.svelte";
 import DialogHost, { showDialog } from "$dialogs/DialogHost.svelte";
 import { handleConfigUpdate, setDisplayUnits } from "$lib/ConfigStore";
 import { handleControllerStateUpdate } from "$lib/ControllerState";
@@ -22,6 +23,9 @@ export function createComponent(component: string, target: HTMLElement, props: R
         case "HelpView":
             return new HelpView({ target, props });
 
+        case "WAxisSettings":
+            return new WAxisSettings({ target, props });
+
         case "DialogHost":
             return new DialogHost({ target, props });