fix(ci): disable Nx Cloud and trim to the essential steps

The build target inherits Nx Cloud cache by default, and the cloud
workspace returns 401 without an access token. Set NX_NO_CLOUD=true and
NX_DAEMON=false at the workflow level so the build runs entirely on the
runner and is not blocked by cloud auth.

Drop the cache step and the artifact upload while CI stabilises — both
are convenience layers, neither is required for "is this branch green".

Author: Confitty Developer

.github/workflows/ci.yml

@@ -13,6 +13,11 @@ concurrency:
 permissions:
   contents: read
 
+env:
+  NX_CLOUD_ACCESS_TOKEN: ""
+  NX_NO_CLOUD: "true"
+  NX_DAEMON: "false"
+
 jobs:
   build:
     name: Type check and production build
@@ -28,14 +33,6 @@ jobs:
         with:
           bun-version: 1.3.11
 
-      - name: Cache Bun store
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
-        with:
-          path: ~/.bun/install/cache
-          key: ${{ runner.os }}-bun-${{ hashFiles('bun.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-bun-
-
       - name: Install dependencies
         run: bun install
 
@@ -44,10 +41,3 @@ jobs:
 
       - name: Production build
         run: bun run build:prod
-
-      - name: Upload build artifacts
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
-        with:
-          name: confitty-dist
-          path: dist/confitty/browser
-          retention-days: 7