fix: normalize keyboard shortcuts to ignore CapsLock and Shift casing

[AdnanQuazi]

Description

This PR fixes a bug where global keyboard shortcuts (Ctrl+Z, Ctrl+D, Ctrl+F, etc.) would silently fail if the user had CapsLock engaged or was holding Shift. It also fixes a minor bug in useStudioEvents.ts where the canRedo function was referenced but not actually executed in the Ctrl+Shift+Z handler.

Root Cause

When CapsLock or Shift is active, KeyboardEvent.key returns the uppercase character (e.g., "Z" instead of "z"). Since the frontend used strict equality checks (e.key === "z"), these shortcuts failed to trigger under those conditions.

Changes

• helpers.ts: Introduced an isKey(e, key) helper that normalizes casing before comparison.
• useStudioEvents.ts: Replaced all raw .key alphabet checks with isKey().
• SearchBlock.vue & ComponentInterface.vue & StudioRightPanel.vue: Applied the isKey() helper to local shortcuts (Ctrl+F and Ctrl+S) for consistency.
• Redo Fix: Changed canRedo to canRedo() to ensure the redo stack check actually evaluates.

Testing

• Enable CapsLock and verify that Ctrl+Z (Undo), Ctrl+Shift+Z (Redo), Ctrl+D (Duplicate) and other shortcuts work correctly on the canvas.

[AdnanQuazi]

@ruchamahabal Please review this PR.