feat(handlers): serve /patentstyle/HL-Patents-Style.dotm as "HL Patents Style.dotm" via Content-Disposition

URL keeps the dashed name for cleanliness; the on-disk filename PA users land in their Downloads folder has the canonical spaces.

internal/handlers/handlers.go

@@ -3,6 +3,7 @@ package handlers
 import (
 	"encoding/json"
 	"net/http"
+	"strings"
 
 	"mgit.msbls.de/m/paliad/internal/auth"
 	"mgit.msbls.de/m/paliad/internal/services"
@@ -21,6 +22,19 @@ func noCacheAssets(h http.Handler) http.Handler {
 	})
 }
 
+// patentstyleDownload sets a Content-Disposition with the spaced filename
+// "HL Patents Style.dotm" for .dotm requests under /patentstyle/. The URL
+// path stays clean (dashes), browsers and download tools land the file
+// with the name PAs expect to see.
+func patentstyleDownload(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasSuffix(r.URL.Path, ".dotm") {
+			w.Header().Set("Content-Disposition", `attachment; filename="HL Patents Style.dotm"`)
+		}
+		h.ServeHTTP(w, r)
+	})
+}
+
 // noCachePages wraps a handler so its response always revalidates. Combined
 // with the build-time `?v=<buildVersion>` stamp on /assets/*.js and /css URLs
 // in dist/*.html, this is what makes a deploy actually reach users: the HTML
@@ -176,8 +190,11 @@ func Register(mux *http.ServeMux, client *auth.Client, giteaAPIToken string, svc
 	// the installed Word client polls; HL-Patents-Style.dotm is fetched on
 	// version mismatch. Source files live in frontend/public/patentstyle/
 	// (copied into dist/ at build time). noCacheAssets ensures the manifest
-	// is never stale after a release.
-	mux.Handle("GET /patentstyle/", noCacheAssets(http.StripPrefix("/patentstyle/", http.FileServer(http.Dir("dist/patentstyle")))))
+	// is never stale after a release. patentstyleDownload renames the .dotm
+	// to "HL Patents Style.dotm" (with spaces) on download — the on-disk
+	// filename has dashes so the URL is clean, but Word users expect the
+	// spaced name in their downloads folder.
+	mux.Handle("GET /patentstyle/", noCacheAssets(patentstyleDownload(http.StripPrefix("/patentstyle/", http.FileServer(http.Dir("dist/patentstyle"))))))
 
 	// Protected routes
 	protected := http.NewServeMux()