fix: make save shortcut (Ctrl/Cmd+S) tolerate CapsLock when editing text (#9281) - #12026

Summary

actionSaveToActiveFile.keyTest was case-sensitive (event.key === KEYS.S). When CapsLock is ON, event.key is uppercase "S", so the shortcut no longer matches.

While editing a text element, the WYSIWYG editor's onkeydown (packages/excalidraw/wysiwyg/textWysiwyg.tsx) relies on actionSaveToActiveFile.keyTest to intercept Ctrl/Cmd+S and call preventDefault() + save. With CapsLock the keyTest fails, the save branch is skipped, preventDefault() is not called, and the browser default "Save Page As" fires instead of saving the .excalidraw file. This is the bug reported in #9281.

Fix

Make the keyTest case-insensitive: event.key.toLowerCase() === KEYS.S. This matches the existing actionSaveFileToDisk.keyTest (already case-insensitive with event.key.toLowerCase()).

-    event.key === KEYS.S && event[KEYS.CTRL_OR_CMD] && !event.shiftKey,
+    event.key.toLowerCase() === KEYS.S &&
+    event[KEYS.CTRL_OR_CMD] &&
+    !event.shiftKey,

Tests

Added packages/excalidraw/tests/saveShortcutTextEditing.test.tsx:

• Ctrl/Cmd+S with CapsLock ON (event.key === "S") must save + preventDefault (reproduces the bug — fails before this fix, passes after).
• Plain Ctrl/Cmd+S saves + preventDefault.
• Ctrl/Cmd+Shift+S (save-as) is not hijacked by the save-to-active-file path (unchanged).
• An unrelated Ctrl/Cmd+b key keeps the existing bail behavior (no preventDefault).
• Escape still finalizes the editor.

Scope

• packages/excalidraw/actions/actionExport.tsx — 1-line behavior change the keyTest.
• packages/excalidraw/tests/saveShortcutTextEditing.test.tsx — new regression test.

Closes #9281