fix: resolve 18 QA-discovered bugs across tools, previews, and the AI pipeline (#242)

Exhaustive QA sweep of all 157 tools. Fixes: CSP blob media, csv-excel ExcelJS interop, ocr-pdf segfault, chart-maker upload, non-PDF doc preview, RAW decode, merge-tool multi-file path, html-to-image chromium, ogv/wma/amr/ac3 preview fallbacks, meme/gif/stabilize codecs, nav+home a11y. Plus orphan-format and test-debt cleanup, the AI bundle build script, and a reusable Playwright QA harness under tests/qa/.

packages/shared/src/i18n/ru.ts

@@ -727,6 +727,7 @@ export const ru: TranslationKeys = {
       loadFailed: "Failed to load document.",
       previousPage: "Previous page",
       nextPage: "Next page",
+      inputNotPreviewable: "Preview not available for this file type",
     },
   },
   toolSettings: {
@@ -2480,6 +2481,7 @@ export const ru: TranslationKeys = {
     downloadAsFile: "Download as file",
     downloadAll: "Download All",
     downloadFiles: "Download {count} files",
+    audioDecodeUnsupported: "This audio format cannot be previewed in the browser",
   },
   homePage: {
     generatingPreview: "Генерация предпросмотра...",
@@ -2498,6 +2500,7 @@ export const ru: TranslationKeys = {
     documents: "Documents",
     data: "Data",
     toolCount: "{count} tools",
+    heading: "SnapOtter Tools",
   },
   fullscreenGrid: {
     searchPlaceholder: "Поиск инструментов...",
@@ -3462,5 +3465,6 @@ export const ru: TranslationKeys = {
     settingsDialog: "Settings",
     helpDialog: "Help",
     navigationMenu: "Navigation",
+    homeLink: "SnapOtter home",
   },
 } as const;