fix: bottom toolbar layout - show case selector, gray Run Claude button

- Rearranged bottom toolbar: Run Claude + Run Shell left, + case selector center
- Made Run Claude button gray instead of blue gradient
- Fixed mobile CSS that was hiding toolbar-center with display:none
- Reduced toolbar height 20%, increased header height
- Tighter session tab styling (smaller padding, font, border-radius)
- Added version display to header next to logo

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/web/public/app.js

@@ -2503,13 +2503,18 @@ class ClaudemanApp {
   }
 
   handleInit(data) {
-    // Update version display
+    // Update version displays (header and toolbar)
     if (data.version) {
       const versionEl = this.$('versionDisplay');
+      const headerVersionEl = this.$('headerVersion');
       if (versionEl) {
         versionEl.textContent = `v${data.version}`;
         versionEl.title = `Claudeman v${data.version}`;
       }
+      if (headerVersionEl) {
+        headerVersionEl.textContent = `v${data.version}`;
+        headerVersionEl.title = `Claudeman v${data.version}`;
+      }
     }
 
     this.sessions.clear();