Launcher polish: monogram reveal-on-failure + app placeholder on every icon surface (v0.163.1)

(A) The launcher monogram bled through every transparent white logo — it rendered
unconditionally under the img. Now hidden by default (.launch-mono display:none),
revealed only when the img chain fails (onerror adds .launch-tile--noimg).

(B) The /static/app-placeholder.svg default reached only app_list_row. The four
other sanctioned app-logo onerror chains now match the canonical SVG->PNG->placeholder
grammar: backups_apps (aligned row), stacks (infra->infra-logo else placeholder),
app_info hero (screenshots still vanish), deploy (keeps .LogoURL/.LogoPNGURL).

Template/CSS only; no handler/funcmap change. 5 tests + 2 red-proofs.

controller/internal/web/templates/app_info.html

@@ -37,8 +37,8 @@
 <!-- Hero section -->
 <div class="app-info-hero">
     <img class="app-info-logo" src="{{logoURL .Meta.Slug}}"
-         alt="{{.Meta.DisplayName}}"
-         onerror="this.onerror=function(){this.style.display='none'};this.src='{{logoPNGURL .Meta.Slug}}'">
+         alt="{{.Meta.DisplayName}}" data-fallback="/static/app-placeholder.svg"
+         onerror="if(!this.dataset.step){this.dataset.step='1';this.src='{{logoPNGURL .Meta.Slug}}';}else if(this.dataset.fallback&&this.dataset.step==='1'){this.dataset.step='2';this.src=this.dataset.fallback;}else{this.onerror=null;this.style.visibility='hidden';}">
     <div class="app-info-hero-text">
         {{if .AppInfo.Tagline}}
             <p class="app-info-tagline">{{.AppInfo.Tagline}}</p>

controller/internal/web/templates/backups_apps.html

@@ -139,10 +139,12 @@
     <div class="app-backup-row" data-status="{{.Status}}">
         <!-- Aligned to the shared app-row grammar (icon + name left, status + chevron right);
              the expander behavior is untouched — this header is the one allowlisted aligned
-             copy in scripts/app_row_dedup_gate.py, NOT a partial render (it owns the toggle). -->
+             copy in scripts/app_row_dedup_gate.py, NOT a partial render (it owns the toggle).
+             The icon chain matches app_row.html: SVG -> PNG -> /static/app-placeholder.svg, so a
+             logo-less app shows the placeholder here too instead of a hidden dead-end (v0.163.1). -->
         <div class="app-backup-row-header" onclick="toggleBackupDetail(this)">
-            <img class="app-row-icon" src="{{logoURL .Slug}}" alt=""
-                 onerror="this.onerror=function(){this.style.visibility='hidden'};this.src='{{logoPNGURL .Slug}}'">
+            <img class="app-row-icon" src="{{logoURL .Slug}}" alt="" data-fallback="/static/app-placeholder.svg"
+                 onerror="if(!this.dataset.step){this.dataset.step='1';this.src='{{logoPNGURL .Slug}}';}else if(this.dataset.fallback&&this.dataset.step==='1'){this.dataset.step='2';this.src=this.dataset.fallback;}else{this.onerror=null;this.style.visibility='hidden';}">
             <span class="app-backup-row-name">{{.DisplayName}}</span>
             <div class="app-backup-row-meta">
                 {{if .DriveDisconnected}}

controller/internal/web/templates/deploy.html

@@ -26,7 +26,8 @@
     {{if .FlashSuccess}}<div class="flash flash-success">{{.FlashSuccess}}</div>{{end}}
     {{if .FlashError}}<div class="flash flash-error">{{.FlashError}}</div>{{end}}
     <div class="deploy-info">
-        <img class="deploy-logo" src="{{.LogoURL}}" alt="" onerror="this.onerror=function(){this.style.display='none'};this.src='{{.LogoPNGURL}}'">
+        <img class="deploy-logo" src="{{.LogoURL}}" alt="" data-fallback="/static/app-placeholder.svg"
+             onerror="if(!this.dataset.step){this.dataset.step='1';this.src='{{.LogoPNGURL}}';}else if(this.dataset.fallback&&this.dataset.step==='1'){this.dataset.step='2';this.src=this.dataset.fallback;}else{this.onerror=null;this.style.visibility='hidden';}">
         <div>
             <h3>{{.Meta.DisplayName}}</h3>
             {{if .Meta.Description}}<p>{{.Meta.Description}}</p>{{end}}

controller/internal/web/templates/launcher.html

@@ -14,7 +14,7 @@
         <span class="launch-tile" style="background: {{tileColor .Slug .BrandColor}}">
             <span class="launch-mono">{{initial .DisplayName}}</span>
             <img class="launch-logo" src="{{logoURL .Slug}}" alt=""
-                 onerror="if(!this.dataset.step){this.dataset.step='1';this.src='{{logoPNGURL .Slug}}';}else{this.onerror=null;this.style.display='none';}">
+                 onerror="if(!this.dataset.step){this.dataset.step='1';this.src='{{logoPNGURL .Slug}}';}else{this.onerror=null;this.style.display='none';this.parentElement.classList.add('launch-tile--noimg');}">
         </span>
         <span class="launch-name">{{.DisplayName}}</span>
         {{if ne (stateStr .State) "running"}}<span class="tag tag-{{stateColor .State}}"><span class="dot"></span>{{stateLabel .State}}</span>{{end}}
@@ -24,7 +24,7 @@
         <span class="launch-tile launch-tile--off" style="background: {{tileColor .Slug .BrandColor}}">
             <span class="launch-mono">{{initial .DisplayName}}</span>
             <img class="launch-logo" src="{{logoURL .Slug}}" alt=""
-                 onerror="if(!this.dataset.step){this.dataset.step='1';this.src='{{logoPNGURL .Slug}}';}else{this.onerror=null;this.style.display='none';}">
+                 onerror="if(!this.dataset.step){this.dataset.step='1';this.src='{{logoPNGURL .Slug}}';}else{this.onerror=null;this.style.display='none';this.parentElement.classList.add('launch-tile--noimg');}">
         </span>
         <span class="launch-name">{{.DisplayName}}</span>
         <span class="tag tag-{{stateColor .State}}"><span class="dot"></span>{{stateLabel .State}}</span>

controller/internal/web/templates/stacks.html

@@ -22,7 +22,7 @@
     <div class="stack-detail-card stack-state-{{stateColor .State}}" data-filter-state="{{filterCategory .State .Deployed}}"{{if .Meta.Slug}} data-href="/apps/{{.Meta.Slug}}"{{end}}>
         <div class="stack-detail-header">
             <div class="stack-title-row">
-                <img class="stack-logo-lg" src="{{logoURL .Meta.Slug}}" alt=""{{if $im}} data-fallback="/static/infra-logo.svg"{{end}}
+                <img class="stack-logo-lg" src="{{logoURL .Meta.Slug}}" alt="" data-fallback="{{if $im}}/static/infra-logo.svg{{else}}/static/app-placeholder.svg{{end}}"
                      onerror="if(!this.dataset.step){this.dataset.step='1';this.src='{{logoPNGURL .Meta.Slug}}';}else if(this.dataset.fallback&&this.dataset.step==='1'){this.dataset.step='2';this.src=this.dataset.fallback;}else{this.onerror=null;this.style.visibility='hidden';}">
                 <div>
                     <h3>{{if $im}}{{$im.DisplayName}}{{else}}{{.Meta.DisplayName}}{{end}}</h3>

controller/internal/web/templates/style.css

@@ -1146,8 +1146,15 @@ a.stat-card:hover {
     transform: translateY(-2px);
     border-color: var(--blue);
 }
+/* The monogram is the logo-less fallback ONLY: hidden by default, revealed when the tile's <img>
+   chain fails (onerror adds .launch-tile--noimg). Otherwise a transparent white glyph would show
+   the letter bleeding through its gaps on every tile (v0.163.1 live finding). */
 .launch-mono {
+    display: none;
     position: absolute;
+    inset: 0;
+    align-items: center;
+    justify-content: center;
     color: #fff;
     font-family: var(--font-ui);
     font-size: 2.4rem;
@@ -1155,6 +1162,7 @@ a.stat-card:hover {
     line-height: 1;
     user-select: none;
 }
+.launch-tile--noimg .launch-mono { display: flex; }
 .launch-logo {
     position: relative;
     width: 58%;