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/src/settings.html

@@ -16,6 +16,9 @@
               <div class="field"><label class="label" for="ret">Keep outbound log rows, days</label>
                 <div class="control"><input class="input" id="ret" name="send_log_retention_days" type="number" min="7" max="365" value="30" required></div>
                 <p class="help">The main driver of <code>/data</code> growth. Does not affect <code>mail.log</code> rotation (fourteen daily files).</p></div>
+              <div class="field"><label class="label" for="inret">Keep inbound log rows, days</label>
+                <div class="control"><input class="input" id="inret" name="inbound_spam_log_retention_days" type="number" min="7" max="365" value="90" required></div>
+                <p class="help">The inbound log also never holds more than 10 000 rows: refused mail is logged at the rate strangers knock on port 25.</p></div>
             </div>
           </div>
         </div>