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/vite.config.ts

@@ -43,7 +43,7 @@ export default defineConfig({
     // a token every time localStorage gets cleared. Empty string (never a
     // real prod secret — see main.ts, only consulted in import.meta.env.DEV)
     // when OIKOS_API_TOKEN isn't set, so the prompt still shows if unconfigured.
-    __OIKOS_DEV_TOKEN__: JSON.stringify(process.env.OIKOS_API_TOKEN ?? ''),
+    __OIKOS_DEV_TOKEN__: JSON.stringify(process.env.OIKOS_API_TOKEN ?? '')
   },
   resolve: {
     alias: {
@@ -52,7 +52,9 @@ export default defineConfig({
       // isn't a SvelteKit app, so point it at a plain shim (see the file).
       // Needs a real filesystem path (not the /src/... shorthand $lib uses)
       // so esbuild's dependency pre-bundler can resolve it too.
-      '$app/environment': fileURLToPath(new URL('./src/lib/shims/app-environment.ts', import.meta.url))
+      '$app/environment': fileURLToPath(
+        new URL('./src/lib/shims/app-environment.ts', import.meta.url)
+      )
     }
   },
   build: {