fix(docker): apply patch-package in the builder stage and set a UTF-8 locale (#3346)

* fix(docker): apply patch-package in the builder stage

The deps stage installs with --ignore-scripts, so the root postinstall never
runs and patches/ghostty-web+0.4.0.patch is never applied. The web bundle in
the Docker image therefore shipped an unpatched ghostty-web renderer.

Run patch-package explicitly in the builder stage, after the full source copy,
before building the web assets.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* fix(docker): set a UTF-8 locale in the runtime image

The oven/bun base image ships with the POSIX locale, so bash readline in the
built-in terminal treated each byte of a multibyte character separately and
garbled the echo of pasted Unicode input.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

Dockerfile

@@ -16,6 +16,10 @@ RUN bun install --frozen-lockfile --ignore-scripts
 FROM deps AS builder
 WORKDIR /app
 COPY . .
+# `deps` installs with --ignore-scripts, so the root postinstall never runs there
+# and the patches/ directory is not present yet. Apply patch-package here, after
+# the full source copy, so the web bundle ships the patched ghostty-web.
+RUN bunx patch-package
 RUN bun run build:web
 
 FROM oven/bun:1.3.14 AS runtime
@@ -53,6 +57,9 @@ RUN npm config set prefix /home/openchamber/.npm-global && mkdir -p /home/opench
 COPY --from=cloudflare/cloudflared@sha256:6d91c121b803126f7a5344005d17a9324788fc09d305b6e2560ec6040a7ae283 /usr/local/bin/cloudflared /usr/local/bin/cloudflared
 
 ENV NODE_ENV=production
+# The base image ships with the POSIX locale, which makes bash readline treat
+# every byte of a multibyte character separately in the built-in terminal.
+ENV LANG=C.UTF-8
 
 COPY scripts/docker-entrypoint.sh /home/openchamber/openchamber-entrypoint.sh