Change Command History shortcut from ⌘H to ⇧⌘H

⌘H is reserved by macOS for "Hide Application" and pre-empts app-level
menu bindings before they ever fire, so the Command History shortcut
never actually worked. Moved to ⇧⌘H and updated all references (in-app
help, macOS Help Book, README).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

oAI/Resources/oAI.help/Contents/Resources/en.lproj/index.html

@@ -1535,7 +1535,7 @@ Whenever the user asks you to translate something, translate it to Norwegian Bok
                     <dt><kbd>⌘L</kbd></dt>
                     <dd>Browse Conversations</dd>
 
-                    <dt><kbd>⌘H</kbd></dt>
+                    <dt><kbd>⇧⌘H</kbd></dt>
                     <dd>Command History</dd>
 
                     <dt><kbd>⌘M</kbd></dt>

oAI/Views/Screens/HelpView.swift

@@ -52,7 +52,7 @@ private let helpCategories: [CommandCategory] = [
             brief: "View command history",
             detail: "Opens a searchable modal showing all your previous messages with timestamps in European format (dd.MM.yyyy HH:mm:ss). Search by text content or date to find specific messages. Click any entry to reuse it.",
             examples: ["/history"],
-            shortcut: "⌘H"
+            shortcut: "⇧⌘H"
         ),
         CommandDetail(
             command: "/clear",

oAI/oAIApp.swift

@@ -132,7 +132,7 @@ struct oAIApp: App {
                 Divider()
 
                 Button("Command History") { chatViewModel.showHistory = true }
-                    .keyboardShortcut("h", modifiers: .command)
+                    .keyboardShortcut("h", modifiers: [.command, .shift])
 
                 Button("In-App Help") { chatViewModel.showHelp = true }
                     .keyboardShortcut("/", modifiers: .command)