chore: fix newly generated stylelint error

Color functions `rgb()` and `hsl()` have aliases `rgba()` and `hsla()`. Those are exactly equivalent, and it's preferable to use the first variant without `a`.

Author: ACTCD

src/app/App.svelte

@@ -246,7 +246,7 @@
 
 	.modal-overlay {
 		backdrop-filter: blur(5px);
-		background-color: rgba(0 0 0 / 0.5);
+		background-color: rgb(0 0 0 / 0.5);
 		place-content: center;
 		place-items: center;
 		position: fixed;

src/ext/extension-page/Components/ModalWrapper.svelte

@@ -70,7 +70,7 @@
 		align-items: center;
 		backdrop-filter: blur(3px);
 		-webkit-backdrop-filter: blur(3px);
-		background-color: light-dark(rgba(0 0 0 / 0.15), rgba(0 0 0 / 0.45));
+		background-color: light-dark(rgb(0 0 0 / 0.15), rgb(0 0 0 / 0.45));
 		color: var(--text-color-secondary);
 		display: flex;
 		font: var(--text-medium);

src/shared/variables.css

@@ -58,7 +58,7 @@
 	--editor-cursor: #e3e7eb;
 	--editor-matching-bracket-color: #fff;
 	--editor-matching-bracket-border: var(--editor-number);
-	--editor-blurred-background: rgba(50 54 57 / 0.65);
+	--editor-blurred-background: rgb(50 54 57 / 0.65);
 }
 
 /* Light theme */
@@ -98,6 +98,6 @@
 		--editor-cursor: #7e7e7f;
 		--editor-matching-bracket-color: var(--text-color-primary);
 		--editor-matching-bracket-border: #ff00ea;
-		--editor-blurred-background: rgba(255 255 255 / 0.65); /* eeeeeea6 */
+		--editor-blurred-background: rgb(255 255 255 / 0.65); /* eeeeeea6 */
 	}
 }