Retake the screenshots on the new logo, and refresh the README header

Every screenshot still showed the old mark in the topbar -- squashed,
with an illegible ".com" smudge under it. All seven are retaken against
the mock server at the original framing (1420x703, mobile 500x703).

The four Sieve rules in filters.jpg are not seeded by the mock, so they
are rebuilt through the rule builder to match the previous shot:
Newsletters, From the boss, Receipts, Build failures.

Date format is pinned to the locale default so the list reads "Aug 24"
as it did before, rather than the "24.08." the stored preference had
drifted to.

README: the header logo drops 180 -> 150 wide, since the mark alone is
portrait where the old artwork was landscape, and the note about the
prototype now says the logo has lost its wordmark too.

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img src="web/public/img/logo.png" alt="ihasmail" width="180">
+  <img src="web/public/img/logo.png" alt="ihasmail" width="150">
 </p>
 
 <p align="center">
@@ -16,7 +16,9 @@ ihasmail is a JMAP-first web client: mail, calendars, contacts, files, filters a
 
 > Status: 2.0 rewrite, in QA against a live Stalwart server — **0.16.19**
 > since 2026-08-25, 0.15.5 before that. The previous FastAPI/HTMX prototype
-> has been removed entirely (only the logo survived).
+> has been removed entirely (only the logo survived, and it has since lost
+> the `.com` wordmark it used to carry — ihasmail is the software, not the
+> hosted instance).
 
 ihasmail supports both generations of Stalwart, which are less alike than the
 version numbers suggest: 0.16 replaced the REST management API with JMAP