refactor(file-upload): SSR-first state, click-to-replace, cleaner preview

- Server renders initial file-upload state (src, alt, label text,
  has-current class) so there is no flash of broken-image icon while
  JS boots. JS no longer duplicates that work — it only reacts to
  user input (select, clear, drag-and-drop) and uses data-current-src
  solely to restore the server file after a blob preview.
- Clicking the current preview image now opens the file dialog, mirrors
  the Replace button, with hover affordance (cursor + primary border).
- Drop the transparency checker pattern in the preview — the admin UI
  does not need Figma-style transparency semantics. Preview is now a
  flat theme-aware surface (--app-preview-bg) that keeps white or
  black logos visible against a neutral gray.
- Move tenant favicon out of the aside into the Master-data tab as its
  own details block next to the Tenant-logos section. Uses the same
  barrier-form pattern (HTML5 form attribute + app-file-upload.phtml)
  for a consistent instant-upload UX.
- Tenant-logo slot label is a native <label> element — picks up the
  global form-label typography and spacing, no custom muted-color
  class needed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/css/base/variables.base.css

@@ -120,8 +120,7 @@
   --app-text-selection-color: rgba(2, 154, 232, 0.25);
   --app-muted-color: #646b79;
   --app-muted-border-color: rgb(231, 234, 239.5);
-  --app-preview-checker-bg: #ffffff;
-  --app-preview-checker-fg: #eef0f3;
+  --app-preview-bg: #e8ebef;
   --app-button-filled-shadow:
     inset 0 1px 0 rgba(255, 255, 255, 0.2),
     0 1px 2px rgba(0, 0, 0, 0.12);
@@ -632,8 +631,7 @@
   --app-text-selection-color: rgba(1, 170, 255, 0.1875);
   --app-muted-color: #6e6e6c;
   --app-muted-border-color: #2f2f2d;
-  --app-preview-checker-bg: #2a2a28;
-  --app-preview-checker-fg: #363634;
+  --app-preview-bg: #262a2f;
   --app-button-neutral-bg: #30343b;
   --app-button-neutral-bg-hover: #3b4048;
   --app-button-neutral-border: #464b54;

web/css/components/app-file-upload.css

@@ -32,15 +32,15 @@
     object-fit: contain;
     object-position: center;
     border: 1px solid var(--app-muted-border-color);
-    background-color: var(--app-preview-checker-bg);
-    background-image:
-      linear-gradient(45deg, var(--app-preview-checker-fg) 25%, transparent 25%),
-      linear-gradient(-45deg, var(--app-preview-checker-fg) 25%, transparent 25%),
-      linear-gradient(45deg, transparent 75%, var(--app-preview-checker-fg) 75%),
-      linear-gradient(-45deg, transparent 75%, var(--app-preview-checker-fg) 75%);
-    background-size: 16px 16px;
-    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
+    background-color: var(--app-preview-bg);
     box-sizing: border-box;
+    cursor: pointer;
+    transition: border-color 0.15s ease, opacity 0.15s ease;
+  }
+
+  .app-file-upload-current-image:hover {
+    border-color: var(--app-primary);
+    opacity: 0.92;
   }
 
   .app-file-upload-current-meta {
@@ -189,14 +189,7 @@
     object-fit: contain;
     object-position: center;
     border: 1px solid var(--app-muted-border-color);
-    background-color: var(--app-preview-checker-bg);
-    background-image:
-      linear-gradient(45deg, var(--app-preview-checker-fg) 25%, transparent 25%),
-      linear-gradient(-45deg, var(--app-preview-checker-fg) 25%, transparent 25%),
-      linear-gradient(45deg, transparent 75%, var(--app-preview-checker-fg) 75%),
-      linear-gradient(-45deg, transparent 75%, var(--app-preview-checker-fg) 75%);
-    background-size: 16px 16px;
-    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
+    background-color: var(--app-preview-bg);
     box-sizing: border-box;
   }
 

web/css/components/app-tenant-logo.css

@@ -18,20 +18,15 @@
     max-height: calc(var(--app-topbar-height) - 1rem);
   }
 
-  /* Tenant-edit "Tenant logos" slots — two Pico .grid columns. */
+  /* Tenant-edit "Tenant logos" slots — two Pico .grid columns.
+     The slot's <label> uses the standard form-label rule (block,
+     margin-bottom, --app-color, text-sm) so it matches other inputs. */
   .tenant-logo-slot {
     display: flex;
     flex-direction: column;
-    gap: 0.5rem;
     min-width: 0;
   }
 
-  .tenant-logo-slot-label {
-    font-size: var(--text-sm);
-    color: var(--app-muted-color);
-    margin: 0;
-  }
-
   .tenant-logo-actions {
     display: flex;
     justify-content: flex-end;

web/js/components/app-file-upload.js

@@ -68,27 +68,16 @@ export function initFileUpload(root) {
   const filenameEl = root.querySelector('.app-file-upload-filename');
   const filesizeEl = root.querySelector('.app-file-upload-filesize');
   const clearButton = root.querySelector('.app-file-upload-clear');
-  const currentImage = root.querySelector('.app-file-upload-current-image');
-  const currentLabel = root.querySelector('.app-file-upload-current-label');
   const replaceButton = root.querySelector('.app-file-upload-replace-button');
+  const currentImage = root.querySelector('.app-file-upload-current-image');
 
   const cleanupFns = [];
   let dragCounter = 0;
 
-  // ── Initialize current file state from data attributes ──
+  // Server rendered the initial state (img src + label + has-current class).
+  // `data-current-src` is kept so clearFile() can restore the server file
+  // after a user previewed a different selection.
   const currentSrc = (root.dataset.currentSrc || '').trim();
-  const currentLabelText = (root.dataset.currentLabel || '').trim();
-
-  if (currentSrc) {
-    root.classList.add('has-current');
-    if (currentImage) {
-      currentImage.src = currentSrc;
-      currentImage.alt = currentLabelText;
-    }
-    if (currentLabel) {
-      currentLabel.textContent = currentLabelText;
-    }
-  }
 
   // ── Show pending file (new selection) ──
   const showFile = (file) => {
@@ -175,15 +164,19 @@ export function initFileUpload(root) {
     cleanupFns.push(() => clearButton.removeEventListener('click', onClear));
   }
 
-  // ── Replace button → open file dialog ──
+  // ── Replace button + click on current preview → open file dialog ──
+  const openPicker = (e) => {
+    e.preventDefault();
+    e.stopPropagation();
+    input.click();
+  };
   if (replaceButton) {
-    const onReplace = (e) => {
-      e.preventDefault();
-      e.stopPropagation();
-      input.click();
-    };
-    replaceButton.addEventListener('click', onReplace);
-    cleanupFns.push(() => replaceButton.removeEventListener('click', onReplace));
+    replaceButton.addEventListener('click', openPicker);
+    cleanupFns.push(() => replaceButton.removeEventListener('click', openPicker));
+  }
+  if (currentImage) {
+    currentImage.addEventListener('click', openPicker);
+    cleanupFns.push(() => currentImage.removeEventListener('click', openPicker));
   }
 
   // ── Drag and drop ──