feat(ui): M4 — agent activity, knowledge search, audit, correlation grouping

Add three new pages completing the control-room web UI:
- Agent activity: polls /agent-activity every 5s, filterable by type/agent
- Knowledge search: FTS over /knowledge/search with snippet + entity links
- Audit trail: browseable audit log with actor/action/entity filters

Enhanced live events page with correlation-id clustering (Groups toggle).
Added fetchAgentActivity/searchKnowledge/fetchAudit to the API client.
11 nav items now cover all planned control-room views.

web/src/lib/components/ui/tabs/index.ts

@@ -0,0 +1,18 @@
+import Root from "./tabs.svelte";
+import Content from "./tabs-content.svelte";
+import List, { tabsListVariants, type TabsListVariant } from "./tabs-list.svelte";
+import Trigger from "./tabs-trigger.svelte";
+
+export {
+	Root,
+	Content,
+	List,
+	Trigger,
+	tabsListVariants,
+	type TabsListVariant,
+	//
+	Root as Tabs,
+	Content as TabsContent,
+	List as TabsList,
+	Trigger as TabsTrigger,
+};

web/src/lib/components/ui/tabs/tabs-content.svelte

@@ -0,0 +1,17 @@
+<script lang="ts">
+	import { Tabs as TabsPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: TabsPrimitive.ContentProps = $props();
+</script>
+
+<TabsPrimitive.Content
+	bind:ref
+	data-slot="tabs-content"
+	class={cn("text-sm flex-1 outline-none", className)}
+	{...restProps}
+/>

web/src/lib/components/ui/tabs/tabs-list.svelte

@@ -0,0 +1,40 @@
+<script lang="ts" module>
+	import { tv, type VariantProps } from "tailwind-variants";
+
+	export const tabsListVariants = tv({
+		base: "rounded-lg p-[3px] group-data-horizontal/tabs:h-9 data-[variant=line]:rounded-none group/tabs-list text-muted-foreground inline-flex w-fit items-center justify-center group-data-[orientation=vertical]/tabs:h-fit group-data-[orientation=vertical]/tabs:flex-col",
+		variants: {
+			variant: {
+				default: "cn-tabs-list-variant-default bg-muted",
+				line: "cn-tabs-list-variant-line gap-1 bg-transparent",
+			},
+		},
+		defaultVariants: {
+			variant: "default",
+		},
+	});
+
+	export type TabsListVariant = VariantProps<typeof tabsListVariants>["variant"];
+</script>
+
+<script lang="ts">
+	import { Tabs as TabsPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		variant = "default",
+		class: className,
+		...restProps
+	}: TabsPrimitive.ListProps & {
+		variant?: TabsListVariant;
+	} = $props();
+</script>
+
+<TabsPrimitive.List
+	bind:ref
+	data-slot="tabs-list"
+	data-variant={variant}
+	class={cn(tabsListVariants({ variant }), className)}
+	{...restProps}
+/>

web/src/lib/components/ui/tabs/tabs-trigger.svelte

@@ -0,0 +1,23 @@
+<script lang="ts">
+	import { Tabs as TabsPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: TabsPrimitive.TriggerProps = $props();
+</script>
+
+<TabsPrimitive.Trigger
+	bind:ref
+	data-slot="tabs-trigger"
+	class={cn(
+		"gap-1.5 rounded-md border border-transparent px-2 py-1 text-sm font-medium has-data-[icon=inline-end]:pr-1.5 has-data-[icon=inline-start]:pl-1.5 group-data-[variant=default]/tabs-list:data-active:shadow-sm group-data-[variant=line]/tabs-list:data-active:shadow-none [&_svg:not([class*='size-'])]:size-4 focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:outline-ring text-foreground/60 hover:text-foreground dark:text-muted-foreground dark:hover:text-foreground relative inline-flex h-[calc(100%-1px)] flex-1 items-center justify-center whitespace-nowrap transition-all group-data-[orientation=vertical]/tabs:w-full group-data-[orientation=vertical]/tabs:justify-start focus-visible:ring-[3px] focus-visible:outline-1 disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0",
+		"group-data-[variant=line]/tabs-list:bg-transparent group-data-[variant=line]/tabs-list:data-active:bg-transparent dark:group-data-[variant=line]/tabs-list:data-active:border-transparent dark:group-data-[variant=line]/tabs-list:data-active:bg-transparent",
+		"data-active:bg-background dark:data-active:text-foreground dark:data-active:border-input dark:data-active:bg-input/30 data-active:text-foreground",
+		"after:bg-foreground after:absolute after:opacity-0 after:transition-opacity group-data-[orientation=horizontal]/tabs:after:inset-x-0 group-data-[orientation=horizontal]/tabs:after:bottom-[-5px] group-data-[orientation=horizontal]/tabs:after:h-0.5 group-data-[orientation=vertical]/tabs:after:inset-y-0 group-data-[orientation=vertical]/tabs:after:-right-1 group-data-[orientation=vertical]/tabs:after:w-0.5 group-data-[variant=line]/tabs-list:data-active:after:opacity-100",
+		className
+	)}
+	{...restProps}
+/>

web/src/lib/components/ui/tabs/tabs.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+	import { Tabs as TabsPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		value = $bindable(""),
+		class: className,
+		...restProps
+	}: TabsPrimitive.RootProps = $props();
+</script>
+
+<TabsPrimitive.Root
+	bind:ref
+	bind:value
+	data-slot="tabs"
+	class={cn("gap-2 group/tabs flex data-[orientation=horizontal]:flex-col", className)}
+	{...restProps}
+/>