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/desktop-shell/Taskbar.svelte

@@ -51,7 +51,6 @@
       wm.focus(id)
     }
   }
-
 </script>
 
 <div class="flex h-11 shrink-0 items-center gap-1.5 border-t bg-muted/30 px-2">
@@ -77,14 +76,19 @@
           class="flex h-8 max-w-56 items-center gap-1.5 rounded-md border px-2 font-mono text-xs transition-colors {$wmState.focusedId ===
             win.id && win.stage !== 'minimized'
             ? 'border-primary/50 bg-primary/10 text-foreground'
-            : 'border-transparent bg-card/60 text-muted-foreground hover:bg-muted'} {win.stage === 'minimized' ? 'opacity-60' : ''}"
+            : 'border-transparent bg-card/60 text-muted-foreground hover:bg-muted'} {win.stage ===
+          'minimized'
+            ? 'opacity-60'
+            : ''}"
           onclick={() => toggle(win.id, win)}
           title={win.title}
         >
           {#if Icon}<Icon class="size-3.5 shrink-0" />{/if}
           <span class="min-w-0 truncate">{truncateMiddle(win.title, 26)}</span>
           {#if badge > 0}
-            <span class="flex h-3.5 min-w-3.5 shrink-0 items-center justify-center rounded-full bg-destructive px-1 text-[9px] font-semibold text-destructive-foreground">
+            <span
+              class="flex h-3.5 min-w-3.5 shrink-0 items-center justify-center rounded-full bg-destructive px-1 text-[9px] font-semibold text-destructive-foreground"
+            >
               {badge > 99 ? '99+' : badge}
             </span>
           {/if}