design: Inbound log and Filter lists as built; inbound retention; Help

Mockup-first step of inbound-antispam-panel 6/12. The two screens were
drawn for the redesign before the feature existed; this brings them to
what steps 3-5 built.

in-log: the lead says where rows come from and how long they are kept;
a help link in the box head; Why is the engine and the detail as the
journal holds them (rspamd: action, score / threshold, weighted
symbols; postfix and a refusing filter: the reply text). No row
invents what the journal cannot hold: the "selfpost - upstream timed
out" tempfail and the Review link to a quarantine page that does not
exist are gone, a refused message has no subject, an allow-listed one
shows SELFPOST_ALLOW_FROM(-100.00).

in-filter-lists: Remove is a POST - the kit's row action, not a link;
a domain entry is shown as stored, without "@"; "Where the lists go"
names the directory and its six files instead of allow.map / deny.map,
says rspamd rereads them by itself and that Deny wins.

settings: "Keep inbound log rows, days" in the Log retention box.

help: two topics under Inbound, Inbound log and Filter lists, and a
sentence in Settings.

outlines.json rewritten: Help's Inbound box has six topics, was four.
check.py: 32 screens, 0 violations.

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

docs/assets/panel-redesign/panel/outlines.json

@@ -123,7 +123,7 @@
      "is-9": [
       "box[Overview]:help×3",
       "box[Outbound]:help×6",
-      "box[Inbound]:help×4",
+      "box[Inbound]:help×6",
       "box[Server]:help×3",
       "box[Account]:help"
      ]