style(web): fix prettier config, format entire web/ tree

.prettierrc.json was missing "semi": false, so prettier wanted to add
semicolons to a codebase written without them (763 semicolon-free
statements vs. 150 with, in hand-written .ts; zero hand-written .svelte
files use them at all). That's why prettier --check failed on 249 files
— not because the code was unformatted, but because the config didn't
match the actual house style. Added "semi": false; left printWidth/etc
as configured (printWidth barely moves the failure count: 218/213/212
files at 100/120/140).

Ran `prettier --write .` with the corrected config. Verified
semantics-preserving before and after:
- eslint: 142 problems both before and after, byte-identical
- build passes, 38/38 tests pass
- token-stream diff (whitespace/semicolons/quotes normalized) on all
  218 changed files: only 52 had any remaining token change, all either
  trailing-comma removal (matching trailingComma: "none") or import/
  ternary reflow — no semantic changes
- live smoke test: Knowledge, Tasks, Fleet map, and a chat window
  (AgentTrace, markdown, Scope graph, activity rail) all render
  correctly, no console errors

Most of the diff is shadcn/ui vendor files (lib/components/ui/) moving
from the CLI's own style (double quotes, tabs, semicolons) to house
style; re-running `shadcn-svelte add` on a component will need a
follow-up format pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/lib/components/ui/dropdown-menu/dropdown-menu-sub-trigger.svelte

@@ -1,29 +1,29 @@
 <script lang="ts">
-	import { DropdownMenu as DropdownMenuPrimitive } from "bits-ui";
-	import ChevronRightIcon from '@lucide/svelte/icons/chevron-right';
-	import { cn } from "$lib/utils.js";
+  import { DropdownMenu as DropdownMenuPrimitive } from 'bits-ui'
+  import ChevronRightIcon from '@lucide/svelte/icons/chevron-right'
+  import { cn } from '$lib/utils.js'
 
-	let {
-		ref = $bindable(null),
-		class: className,
-		inset,
-		children,
-		...restProps
-	}: DropdownMenuPrimitive.SubTriggerProps & {
-		inset?: boolean;
-	} = $props();
+  let {
+    ref = $bindable(null),
+    class: className,
+    inset,
+    children,
+    ...restProps
+  }: DropdownMenuPrimitive.SubTriggerProps & {
+    inset?: boolean
+  } = $props()
 </script>
 
 <DropdownMenuPrimitive.SubTrigger
-	bind:ref
-	data-slot="dropdown-menu-sub-trigger"
-	data-inset={inset}
-	class={cn(
-		"focus:bg-accent focus:text-accent-foreground data-open:bg-accent data-open:text-accent-foreground not-data-[variant=destructive]:focus:**:text-accent-foreground gap-2 rounded-sm px-2 py-1.5 text-sm data-inset:pl-8 [&_svg:not([class*='size-'])]:size-4 flex cursor-default items-center outline-hidden select-none data-[inset]:pl-8 [&_svg]:pointer-events-none [&_svg]:shrink-0",
-		className
-	)}
-	{...restProps}
+  bind:ref
+  data-slot="dropdown-menu-sub-trigger"
+  data-inset={inset}
+  class={cn(
+    "focus:bg-accent focus:text-accent-foreground data-open:bg-accent data-open:text-accent-foreground not-data-[variant=destructive]:focus:**:text-accent-foreground gap-2 rounded-sm px-2 py-1.5 text-sm data-inset:pl-8 [&_svg:not([class*='size-'])]:size-4 flex cursor-default items-center outline-hidden select-none data-[inset]:pl-8 [&_svg]:pointer-events-none [&_svg]:shrink-0",
+    className
+  )}
+  {...restProps}
 >
-	{@render children?.()}
-	<ChevronRightIcon class="ml-auto" />
+  {@render children?.()}
+  <ChevronRightIcon class="ml-auto" />
 </DropdownMenuPrimitive.SubTrigger>