feat(modality): rename "file" modality label "Data" -> "Files"

The fifth user-facing group is now Image, Video, Audio, PDF, Files
(internal modality id stays "file"; section.ts "files" was already
"Files"). Updates modality.ts label + comment, all 21 i18n locales
(categories.data "Data Files"->"Files", modalities.documentsAndFiles
"PDF & Data"->"PDF & Files", dead homePage.data), landing cards/hero
search/tools filter, docs headings, and e2e modality-tab assertions
(/^Data/ -> /^Files/, which had been failing).

packages/shared/src/i18n/ru.ts

@@ -63,14 +63,14 @@ export const ru: TranslationKeys = {
     "pdf-security": "Security",
     "pdf-optimize": "Optimize",
     "doc-convert": "Convert",
-    data: "Data Files",
+    data: "Files",
     archives: "Archives",
   },
   modalities: {
     image: "Image",
     video: "Video",
     audio: "Audio",
-    documentsAndFiles: "PDF & Data",
+    documentsAndFiles: "PDF & Files",
   },
   tools: {
     resize: {
@@ -2498,7 +2498,7 @@ export const ru: TranslationKeys = {
     clearSearch: "Clear search",
     all: "All",
     documents: "PDF",
-    data: "Data",
+    data: "Files",
     pdf: "PDF",
     files: "Files",
     toolCount: "{count} tools",