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 new
`failedAlbums` of the result and of `--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,
gets its ID. A name over 255 bytes (250 for a folder, which leaves room for
`.json`) gets the ID and is cut short between two characters by
`shortenToBytes` in `src/filename.ts`. A link's ID goes right before its
extension.

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/197,
-https://git.eeqj.de/sneak/quak/issues/198,
+Three bugs are open: https://git.eeqj.de/sneak/quak/issues/198,
 https://git.eeqj.de/sneak/quak/issues/199 and
 https://git.eeqj.de/sneak/quak/issues/205. The check of quak against a live Ente
 account, https://git.eeqj.de/sneak/quak/issues/187, needs an account only sneak
@@ -42,6 +41,15 @@ declares one.
   `unknown`. The shapes were found by running the binary against local
   listeners.
 
+- 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: A network failure is printed and recorded with its reason, not as
   just `fetch failed` (issue 196). `describeError` in `src/errors.ts` gives an
   error's message followed by the message of each error on its `cause` chain,