feat(editor): Implement drawing tools and advanced undo/redo

This commit significantly enhances the web spectrogram editor by implementing core drawing tools (line, ellipse, noise) and a robust undo/redo system.

-  and : Added redo button and styling.

- : Implemented canvas event handling, dynamic shape previews, and the  logic for lines and noise rectangles.

- : Now reconstructs the spectrogram from a clean base, allowing proper undo/redo.

- : Uses an improved color gradient for better visualization.

- : Stores original spectrogram data for persistent state management.

1 files changed, 2 insertions, 0 deletions

diff --git a/tools/editor/index.html b/tools/editor/index.html
index 73356bd..914ac93 100644
--- a/tools/editor/index.html
+++ b/tools/editor/index.html
@@ -19,6 +19,8 @@
             <button id="lineTool">Line</button>
             <button id="ellipseTool">Ellipse</button>
             <button id="noiseTool">Noise</button>
+            <button id="undoButton">Undo</button>
+            <button id="redoButton">Redo</button>
             <!-- Add more tool controls later -->
         </div>
     </div>