Names quak builds from server data fit in 255 bytes (closes #205)

The default names of `quak get`, `quak get-thumb`, `downloadFile` and `downloadThumbnail`, and the album folders of `backup-metadata`, could be over 255 bytes, which a file system refuses. `defaultFileName` and `shortenKeepingExtension` in `src/filename.ts` now cut such a name short, keeping its extension when it fits; a live photo's image and video get their own extension before the cut. A cut name never starts with a dot and is never a Windows device name. `--out` and `outPath` are kept as given. A `backup-metadata` folder keeps its `<id>-`. `safeExtension` gives `.bin` for an extension of more than 16 letters and digits, so a save path's name always fits.

Model: opus-5-5

src/cli-output.ts

@@ -9,7 +9,7 @@
 // `metadata.title`, and issue #52 requires that output stay byte-identical, so
 // the commands shape their output from the raw `EnteFile` through here.
 
-import { sanitizeFileName } from "./filename.js";
+import { defaultFileName } from "./filename.js";
 import type { EnteFile, FileType, Microseconds } from "./model/types.js";
 
 // One row of `quak files --json`.
@@ -33,11 +33,13 @@ export const fileListRow = (file: EnteFile): FileListRow => ({
 export const fileListLine = (file: EnteFile): string =>
     `${file.id}\t${file.metadata.fileType}\t${file.metadata.title}`;
 
-// Default output path for `quak get` when `--out` is not given. The title comes
-// from the server, so it is sanitized; `--out` is the user's and is used as is.
-export const originalName = (file: EnteFile): string =>
-    sanitizeFileName(file.metadata.title, `file-${file.id}`);
+// Default output path for `quak get` when `--out` is not given, made from the
+// title (see `defaultFileName`), with `ext` in place of its extension for a
+// live photo's image or video; `--out` is the user's and is used as is.
+export const originalName = (file: EnteFile, ext?: string): string =>
+    defaultFileName(file.metadata.title, file.id, { ext });
 
-// Default output path for `quak get-thumb` when `--out` is not given.
+// Default output path for `quak get-thumb` when `--out` is not given: `thumb_`
+// and the title.
 export const thumbnailName = (file: EnteFile): string =>
-    `thumb_${originalName(file)}`;
+    defaultFileName(file.metadata.title, file.id, { prefix: "thumb_" });