feat(terminal): show shift+escape focus hint toast on first terminal open

- Add one-time toast notification showing Shift+Esc shortcut hint
- Internationalize toast text via TERMINAL_FOCUS_HINT string
- Add theme-aware toast styles for light and dark themes

Author: abose

src/extensionsIntegrated/Terminal/main.js

@@ -81,6 +81,7 @@ define(function (require, exports, module) {
     let activeTerminalId = null;  // Currently visible terminal
     let processInfo = {};         // id -> processName from PTY
     let originalDefaultShellName = null; // System-detected default shell name
+    let _focusToastShown = false;       // Show focus hint toast only once per session
     let $panel, $contentArea, $shellDropdown, $flyoutList;
 
     /**
@@ -145,6 +146,7 @@ define(function (require, exports, module) {
                     active.handleResize();
                     active.focus();
                 }
+                _showFocusHintToast();
             }
         });
 
@@ -533,6 +535,35 @@ define(function (require, exports, module) {
         }
     }
 
+    /**
+     * Show a one-time toast hint about Shift+Escape to switch focus
+     */
+    function _showFocusHintToast() {
+        if (_focusToastShown) {
+            return;
+        }
+        _focusToastShown = true;
+
+        const shortcutKey = '<kbd>Shift+Esc</kbd>';
+        const message = StringUtils.format(Strings.TERMINAL_FOCUS_HINT, shortcutKey);
+        const $toast = $('<div class="terminal-focus-toast"></div>')
+            .html('<span class="terminal-toast-text">' + message + '</span>');
+        $contentArea.append($toast);
+
+        // Fade in
+        setTimeout(function () {
+            $toast.addClass("visible");
+        }, 100);
+
+        // Auto-dismiss after 5 seconds
+        setTimeout(function () {
+            $toast.removeClass("visible");
+            setTimeout(function () {
+                $toast.remove();
+            }, 300);
+        }, 5000);
+    }
+
     /**
      * Escape HTML special characters
      */

src/nls/root/strings.js

@@ -1488,6 +1488,7 @@ define({
     "ERROR_TERMINAL_NOT_FOUND": "Terminal was not found for your OS, you can define a custom Terminal command in the settings",
     "TERMINAL_CLOSE_CONFIRM_TITLE": "Active Process Running",
     "TERMINAL_CLOSE_CONFIRM_MSG": "Terminal has an active process running: <b>{0}</b>.<br>Are you sure you want to close it?",
+    "TERMINAL_FOCUS_HINT": "Press {0} to switch between editor and terminal",
     "EXTENDED_COMMIT_MESSAGE": "EXTENDED",
     "GETTING_STAGED_DIFF_PROGRESS": "Getting diff of staged files\u2026",
     "GIT_COMMIT": "Git commit\u2026",

src/styles/Extn-Terminal.less

@@ -399,3 +399,49 @@
     color: var(--terminal-tab-text);
     font-size: 13px;
 }
+
+/* Focus hint toast */
+.terminal-focus-toast {
+    position: absolute;
+    bottom: 12px;
+    left: 50%;
+    transform: translateX(-50%);
+    padding: 6px 14px;
+    border-radius: 6px;
+    font-size: 12px;
+    line-height: 1.4;
+    opacity: 0;
+    transition: opacity 0.3s ease;
+    pointer-events: none;
+    z-index: 10;
+    background: rgba(0, 0, 0, 0.75);
+    color: #e0e0e0;
+}
+
+.terminal-focus-toast.visible {
+    opacity: 1;
+}
+
+.terminal-focus-toast kbd {
+    display: inline-block;
+    padding: 1px 5px;
+    margin: 0 2px;
+    border-radius: 3px;
+    font-family: inherit;
+    font-size: 11px;
+    background: rgba(255, 255, 255, 0.15);
+    border: 1px solid rgba(255, 255, 255, 0.2);
+    color: #fff;
+}
+
+/* Light theme toast */
+.terminal-panel-container .terminal-focus-toast {
+    background: rgba(0, 0, 0, 0.7);
+    color: #f0f0f0;
+}
+
+.terminal-panel-container .terminal-focus-toast kbd {
+    background: rgba(255, 255, 255, 0.2);
+    border-color: rgba(255, 255, 255, 0.25);
+    color: #fff;
+}