Add state management, WebSocket polling, html.js templating, and refactor pages

- lib/state.py: per-subsystem collectors with versioned state store
- daemon/server.py: state refresh on request, batch routing updates
- webui/static/hoover/html.js: new html tag template helper via htm.js
- webui/static/hoover/websocket.js: real-time state change notifications
- webui/static/hoover/vdom.js: VDOM improvements for keyed diff
- All frontend pages refactored to use html templates
- Add tests for state management and polling
- Update docs and AGENTS.md

webui/static/hoover/vdom.js

@@ -21,6 +21,29 @@ export const _unmountFn = { fn: null };
 export function setMountFn(fn) { _mountFn.fn = fn; }
 export function setUnmountFn(fn) { _unmountFn.fn = fn; }
 
+/**
+ * htm event adapter: translates camelCase events (onClick) to Hoover's on:click.
+ */
+export function htmAdapter(tag, props, ...children) {
+    if (tag === '#text' || tag === '#comp' || typeof tag === 'function') {
+        return h(tag, props, ...children);
+    }
+
+    if (props) {
+        const normalized = {};
+        for (const [key, val] of Object.entries(props)) {
+            if (key.startsWith('on') && key.length > 2 && key[2] >= 'A' && key[2] <= 'Z') {
+                normalized['on:' + key.slice(2).toLowerCase()] = val;
+            } else {
+                normalized[key] = val;
+            }
+        }
+        props = normalized;
+    }
+
+    return h(tag, props, ...children);
+}
+
 /**
  * Build a VNode. Three forms:
  *   h('div', { class: 'x' }, h('span', null, 'hi'))   — element