Clippy clean, and rustfmt and clippy part of the checks

cargo clippy --workspace --all-targets had 24 warnings; its own fixes took
most, the rest by hand: two type aliases for long types, a struct built
whole, a checked division, a doc comment's stray blank line. Its fix for
the stale-feed fold was wrong: `any` stops at the first feed it removes,
where the fold removed every one, so that is a loop instead.

A pre-commit hook in .githooks refuses unformatted Rust; clippy, being a
build, is in CLAUDE.md's checks with -D warnings.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/directory/src/store.rs

@@ -424,8 +424,7 @@ impl Store {
     }
 
     pub async fn due_one(&self, id: &str) -> Result<Option<Due>> {
-        Ok(self
-            .rows("SELECT id, url, etag, last_modified FROM feeds WHERE id = $1", vec![id.into()])
+        self.rows("SELECT id, url, etag, last_modified FROM feeds WHERE id = $1", vec![id.into()])
             .await?
             .first()
             .map(|r| -> Result<Due> {
@@ -436,7 +435,7 @@ impl Store {
                     last_modified: r.try_get("", "last_modified")?,
                 })
             })
-            .transpose()?)
+            .transpose()
     }
 
     pub async fn save(&self, id: &str, got: Refreshed) -> Result<()> {
@@ -507,8 +506,8 @@ impl Store {
 /// A feed's last error as its page says it: explained once it has been failing a day, or else
 /// only that the check failed. Never the error itself, which is for the log.
 fn failure_words(err: &str, failing_for: i64) -> String {
-    Some(err)
-        .filter(|_| failing_for >= FLAG_AFTER_SECS)
+    (failing_for >= FLAG_AFTER_SECS)
+        .then_some(err)
         .and_then(ipx_feed::explain_failure)
         .map_or_else(|| "Its last check failed.".to_owned(), |f| f.reason.to_owned())
 }