build: Add HTMX copy step to build:ts script

- Modified package.json build:ts to copy htmx.min.js from node_modules to web/static/
- This fixes the 404 error for /static/htmx.min.js that occurred after ESBuild migration
- Added htmx.min.js to static files

See ESBUILD_MIGRATION_PLAN.md for migration context.

Dockerfile

@@ -8,18 +8,18 @@ RUN apk add --no-cache nodejs npm curl git
 
 # Install Go tools (cached well)
 RUN --mount=type=cache,target=/root/go/pkg/mod \
-    go install github.com/sqlc-dev/sqlc/cmd/sqlc@latest && \
-    go install github.com/a-h/templ/cmd/templ@latest
+  go install github.com/sqlc-dev/sqlc/cmd/sqlc@latest && \
+  go install github.com/a-h/templ/cmd/templ@latest
 
 # Copy package files and install npm dependencies (cached unless package.json changes)
 COPY package*.json ./
 RUN --mount=type=cache,target=/root/.npm \
-    npm ci
+  npm ci
 
 # Copy Go mod files (cached unless go.mod changes)
 COPY go.mod go.sum ./
 RUN --mount=type=cache,target=/root/go/pkg/mod \
-    go mod download
+  go mod download
 
 # Copy source code (this layer changes frequently)
 COPY . .
@@ -34,7 +34,7 @@ RUN npm run build:ts
 
 # Build Go binary (cached unless Go files or generated code changes)
 RUN --mount=type=cache,target=/root/go/pkg/mod \
-    CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main ./cmd/server
+  CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main ./cmd/server
 
 # Test runner stage - includes Go runtime and test dependencies
 # This stage is ONLY used for running tests, never deployed to production
@@ -49,7 +49,7 @@ COPY --from=builder /app ./
 
 # Install kepubify for conversion tests
 RUN wget -O /usr/bin/kepubify https://github.com/pgaskin/kepubify/releases/latest/download/kepubify-linux-64bit \
-    && chmod +x /usr/bin/kepubify
+  && chmod +x /usr/bin/kepubify
 
 # Set test environment variables
 ENV TEST_MODE=true
@@ -66,7 +66,7 @@ RUN apk --no-cache add ca-certificates curl
 
 # Install kepubify for EPUB→KEPUB conversion
 RUN wget -O /usr/bin/kepubify https://github.com/pgaskin/kepubify/releases/latest/download/kepubify-linux-64bit \
-    && chmod +x /usr/bin/kepubify
+  && chmod +x /usr/bin/kepubify
 
 WORKDIR /root/