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/context-menu/context-menu-label.svelte

@@ -1,24 +1,27 @@
 <script lang="ts">
-	import { cn, type WithElementRef } from "$lib/utils.js";
-	import type { HTMLAttributes } from "svelte/elements";
+  import { cn, type WithElementRef } from '$lib/utils.js'
+  import type { HTMLAttributes } from 'svelte/elements'
 
-	let {
-		ref = $bindable(null),
-		class: className,
-		inset,
-		children,
-		...restProps
-	}: WithElementRef<HTMLAttributes<HTMLDivElement>> & {
-		inset?: boolean;
-	} = $props();
+  let {
+    ref = $bindable(null),
+    class: className,
+    inset,
+    children,
+    ...restProps
+  }: WithElementRef<HTMLAttributes<HTMLDivElement>> & {
+    inset?: boolean
+  } = $props()
 </script>
 
 <div
-	bind:this={ref}
-	data-slot="context-menu-label"
-	data-inset={inset}
-	class={cn("text-muted-foreground px-2 py-1.5 text-xs font-medium data-inset:pl-8 data-inset:pl-8", className)}
-	{...restProps}
+  bind:this={ref}
+  data-slot="context-menu-label"
+  data-inset={inset}
+  class={cn(
+    'text-muted-foreground px-2 py-1.5 text-xs font-medium data-inset:pl-8 data-inset:pl-8',
+    className
+  )}
+  {...restProps}
 >
-	{@render children?.()}
+  {@render children?.()}
 </div>