Version the brand images' URLs, so a new mark reaches returning visitors

The logo, favicons and app icons are served from public/img under fixed
names with a browser cache of hours, and the service worker fetches them
through that cache. After the mark changed on 2026-09-27, returning
visitors kept the old cat until their copies expired, and the favicon
and an installed app's icon hold on longer still.

Every URL that names one now carries ?v=BRAND_V (src/lib/brand.ts,
brandImage()): the header, sign-in, About, the mail empty state, the
notification icons, index.html's favicon links, the manifest's icons
and the service worker's shell and notification icons. Date-stamped,
never a counter, for the sites' ASSET_V reason; the three static files
carry the value written out, and the comment says to keep them in step.

web/src/views/AppShell.tsx

@@ -2,8 +2,7 @@ import { lazy, Suspense, useEffect, useRef, useState, type ReactNode } from "rea
 import { Link, useLocation } from "wouter";
 import { Calendar, ChevronsUpDown, FolderOpen, Globe, HelpCircle, LogOut, Mail, Menu as MenuIcon, Moon, PenSquare, Plus, RefreshCw, Settings, ShieldCheck, Sun, Upload, Users, X } from "lucide-react";
 import { useSession } from "@/store/session";
-import { withBase } from "@/lib/basePath";
-import { DEFAULT_APP_NAME } from "@/lib/brand";
+import { DEFAULT_APP_NAME, brandImage } from "@/lib/brand";
 import { InbuxaWordmark } from "@/ui/InbuxaWordmark";
 import { useEffectiveTheme, useSettings } from "@/store/settings";
 import { toggleTarget } from "@/lib/palette";
@@ -148,7 +147,7 @@ export function AppShell({ children }: { children: ReactNode }) {
           <MenuIcon size={22} />
         </button>
         <Link href="/mail" className="brand">
-          <img src={withBase(appName === DEFAULT_APP_NAME ? "/img/inbuxa-mark.png" : "/img/logo.png")} alt="" />
+          <img src={brandImage(appName === DEFAULT_APP_NAME ? "/img/inbuxa-mark.png" : "/img/logo.png")} alt="" />
           {/* A product name, not a word: translated it is a different product.
               Read from the session rather than written here, so a deployment
               that set APP_NAME is called what it calls itself -- the document

web/src/views/Login.tsx

@@ -5,7 +5,7 @@ import { ApiError } from "@/jmap/client";
 import { withBase } from "@/lib/basePath";
 import { APP_VERSION } from "@/lib/version";
 import { DEFAULT_SOURCE_URL } from "@/lib/source";
-import { DEFAULT_APP_NAME } from "@/lib/brand";
+import { DEFAULT_APP_NAME, brandImage } from "@/lib/brand";
 import { t } from "@/lib/i18n";
 import { InbuxaWordmark } from "@/ui/InbuxaWordmark";
 
@@ -92,7 +92,7 @@ export function LoginPage() {
     <div className="login-page">
       <form className="login-card" onSubmit={submit}>
         <div className="logo">
-          <img src={withBase(appName === DEFAULT_APP_NAME ? "/img/inbuxa-mark.png" : "/img/logo.png")} alt="" width={120} height={126} />
+          <img src={brandImage(appName === DEFAULT_APP_NAME ? "/img/inbuxa-mark.png" : "/img/logo.png")} alt="" width={120} height={126} />
           {/* A product name, not a word: not translated, and not guessed at
               from the page it is on. INBUXA's is its wordmark. */}
           <h1 className="notranslate" translate="no">

web/src/views/mail/MailView.tsx

@@ -4,7 +4,6 @@ import { DEFAULT_SORT, useMail, type ListQuery } from "@/store/mail";
 import { appliesTo, comparatorsFor } from "@/lib/listSort";
 import type { Comparator } from "@/jmap/types";
 import { useSettings } from "@/store/settings";
-import { withBase } from "@/lib/basePath";
 import { useCompose } from "@/store/compose";
 import { buildFilter, describeFilter, parseQuery } from "@/lib/search";
 import { keyboard } from "@/lib/input/keyboard";
@@ -21,6 +20,7 @@ import { isUnknownMailbox } from "@/lib/mailbox/mailboxRoute";
 import { scheduledMailboxIdFrom, useScheduled } from "@/store/scheduled";
 import { plural, t as translate, tNode } from "@/lib/i18n";
 import { mailboxDisplayName } from "@/lib/mailbox/mailboxName";
+import { brandImage } from "@/lib/brand";
 
 export function MailView({ mailboxId, threadId, search }: { mailboxId?: string; threadId?: string; search?: boolean }) {
   const [, navigate] = useLocation();
@@ -468,7 +468,7 @@ export function MailView({ mailboxId, threadId, search }: { mailboxId?: string;
             <ThreadView key={`${threadId}:${openMessageId ?? ""}`} threadId={threadId} messageId={openMessageId} mailboxId={mailboxId ?? null} onBack={() => openThread(null)} actions={actions} onNavigate={(delta) => { const idx = currentRowIndex; const next = ids[idx + delta]; const t = next ? rowThreadId(next) : undefined; if (t) { setFocusId(next!); openThread(t, settings.conversationMode ? null : next!); } }} hasPrev={currentRowIndex > 0} hasNext={currentRowIndex >= 0 && currentRowIndex < ids.length - 1} />
           ) : (
             <div className="no-thread">
-              <img src={withBase("/img/logo.png")} alt="" />
+              <img src={brandImage("/img/logo.png")} alt="" />
               <div>
                 {list?.total
                   ? settings.conversationMode

web/src/views/settings/AboutSettings.tsx

@@ -4,9 +4,9 @@ import { useAppName } from "@/lib/brand";
 import { apiFetch, client } from "@/jmap/client";
 import { APP_VERSION } from "@/lib/version";
 import { DEFAULT_SOURCE_URL } from "@/lib/source";
-import { withBase } from "@/lib/basePath";
 import { t, tNode } from "@/lib/i18n";
 import { InbuxaWordmark } from "@/ui/InbuxaWordmark";
+import { brandImage } from "@/lib/brand";
 
 /** ihasmail-inbuxa: which webmail node answered and which mail node it talks to (server/src/nodes.ts). */
 interface Nodes {
@@ -47,7 +47,7 @@ export function AboutSettings() {
           inbuxa's own, not APP_NAME. */}
       <p className="lead">{tNode("{inbuxa} is a complete mail suite: a mail server, the console that administers it, and this webmail, each its own program, installed together and free under the AGPL.", { inbuxa: <strong className="brand-inbuxa notranslate" translate="no">inbuxa</strong> })}</p>
       <div className="row" style={{ gap: 16, alignItems: "center", marginBottom: 16 }}>
-        <img src={withBase("/img/inbuxa-mark.png")} alt="" width={80} />
+        <img src={brandImage("/img/inbuxa-mark.png")} alt="" width={80} />
         <div>
           <InbuxaWordmark height={26} />
           {/* A product name and a version string: neither is a word to translate. */}