fix(storybook): silence NODE_ENV DefinePlugin warning; revert CI memory cap to 4g

.storybook/main.ts: webpack core's auto-DefinePlugin (from optimization.nodeEnv)
and Storybook's own preset both define process.env.NODE_ENV on the same
compile, triggering a "Conflicting values" warning even though both resolve
to "development" locally. Disable the redundant one via webpackFinal.

ci.yml: revert the storybook-a11y container's memory cap 6g -> 4g. The 6g
bump was based on an unconstrained local RSS measurement (~5.8GB) that
doesn't reflect real behavior under a cgroup cap. Verified directly: running
this job's exact steps (npm ci, playwright install, build-storybook,
test-storybook:ci) in `docker run --cpus=2 --memory=4g --memory-swap=4g
node:24-bookworm` completes clean, no OOM, 62/62 suites passing.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -49,13 +49,17 @@ jobs:
     # Hard resource ceiling so a runaway test-storybook (one headless Chromium per Jest
     # worker) can't OOM the runner host — it fails its own container instead. The real cap
     # is `--maxWorkers=2` in test-storybook:ci; this is the belt-and-suspenders guardrail.
-    # 6g (was 4g): build-storybook alone (compodoc + full Angular AOT build) measured ~5.8GB
+    # 4g is enough: verified by running this job's exact steps (npm ci, playwright install,
-    # peak RSS locally, leaving too little headroom at 4g.
+    # build-storybook, test-storybook:ci) in `docker run --cpus=2 --memory=4g
+    # --memory-swap=4g node:24-bookworm` locally — completes clean, no OOM. (An earlier
+    # unconstrained local RSS measurement of build-storybook alone suggested ~5.8GB was
+    # needed, but that number reflects what Node/V8 is willing to use when memory is
+    # plentiful, not what the job actually needs under a real cgroup cap.)
     # NB: requires the Gitea act_runner to allow container jobs (docker mode). If the runner
     # is host-only, drop this `container:` block and rely on the worker cap alone.
     container:
       image: node:24-bookworm
-      options: --cpus=2 --memory=6g --memory-swap=6g
+      options: --cpus=2 --memory=4g --memory-swap=4g
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@v4

.storybook/main.ts

@@ -17,5 +17,12 @@ const config: StorybookConfig = {
   // Serve the vendored CIBG package so preview-head.html can <link> its CSS (and its
   // relative font/icon/image url()s resolve) — mirrors index.html for the real app.
   staticDirs: ['../public'],
+  // Webpack's own auto-DefinePlugin (from `optimization.nodeEnv`) and Storybook's preset both
+  // define `process.env.NODE_ENV` on the same compile, which webpack warns about as
+  // "Conflicting values" even though they resolve to the same string. Disable the redundant one.
+  webpackFinal: async (config) => {
+    config.optimization = { ...config.optimization, nodeEnv: false };
+    return config;
+  },
 };
 export default config;