An album whose folder cannot be made no longer stops the backup (closes #197)

Each album's folder, links and JSON are written inside one try. A failure
prints `FAILED album <name>: <reason>`, lists the album's ID in the result's
new `failedAlbums`, and so in `--json`, and makes `quak backup` exit 1. The
other albums and `failures.json` are still written.

An album whose folder would have another album's JSON name, ignoring case
(`x.json` beside `x`), gets its ID added. A folder or link name over 255
bytes is cut short between two characters by `shortenToBytes` in
`src/filename.ts`, and gets the ID; a folder name leaves room for `.json`.

Apart from its call to `uniqueNames`, the album loop is only indented into
the try.

Model: opus-5-5

TODO.md

@@ -17,8 +17,7 @@ pre-1.0
 
 # Next Step
 
-Four bugs are open: https://git.eeqj.de/sneak/quak/issues/196,
-https://git.eeqj.de/sneak/quak/issues/197,
+Three bugs are open: https://git.eeqj.de/sneak/quak/issues/196,
 https://git.eeqj.de/sneak/quak/issues/198 and
 https://git.eeqj.de/sneak/quak/issues/199. The check of quak against a live Ente
 account, https://git.eeqj.de/sneak/quak/issues/187, needs an account only sneak
@@ -29,6 +28,15 @@ declares one.
 
 # Completed Steps
 
+- 2026-10-15: An album whose folder or JSON `quak backup` cannot write no longer
+  ends the run before the other albums and `failures.json` are written (issue
+  197). The run prints `FAILED album <name>: <reason>`, lists the album's ID in
+  `failedAlbums` in the result and in `--json`, goes on, and exits 1. An album
+  whose folder would have the name of another album's JSON, as `x.json` beside
+  `x` would, gets its ID added. A folder or link name over 255 bytes is cut
+  short between two characters, by `shortenToBytes` in `src/filename.ts`, and
+  gets the ID.
+
 - 2026-10-15: The README says that `make install` needs nix (issue 200), in
   Getting Started and in "Running the backup from cron": `make build-bin` runs
   bun through `nix-shell -p bun`. The `Makefile` is unchanged.