Bump version to 0.2.7 to add upstream share card features

Dockerfile

@@ -14,7 +14,7 @@
 # built for the target platform (emulated when building aarch64 on x86).
 # The UI and API stages pin --platform=$BUILDPLATFORM and cross-compile,
 # which is both correct and far faster than emulating them:
-#   * the Svelte UI emits static assets — no target-arch code at all;
+#   * the Svelte UI emits static assets, no target-arch code at all;
 #   * kamado-api is CGO_ENABLED=0 with a pure-Go SQLite driver
 #     (modernc.org/sqlite), so GOARCH cross-compilation is exact.
 
@@ -93,7 +93,7 @@ COPY assets/scripts/kamado-tls-init.sh /usr/local/bin/kamado-tls-init.sh
 RUN chmod +x /usr/local/bin/kamado-ckpool-run.sh /usr/local/bin/kamado-tls-init.sh \
     && mkdir -p /etc/ckpool /run/ckpool
 
-# Documents the defaults only — the stratum ports are user-configurable and
+# Documents the defaults only, the stratum ports are user-configurable and
 # StartOS publishes ports from the interface bindings, not from EXPOSE.
 EXPOSE 3333 3334 8080
 WORKDIR /root