fix(SetupFont): correct line height increase handler

- Fixed copy-paste error in SetupFontMenu.svelte line 43
- Changed onIncrease from fontSizeStore.increase to lineHeightStore.increase
- Line height control now correctly modifies line height instead of font size

Closes #?

src/features/SetupFont/model/stores/lineHeightStore.ts

@@ -0,0 +1,19 @@
+import {
+    type ControlModel,
+    createControlStore,
+} from '$shared/store/createControlStore';
+import {
+    DEFAULT_LINE_HEIGHT,
+    LINE_HEIGHT_STEP,
+    MAX_LINE_HEIGHT,
+    MIN_LINE_HEIGHT,
+} from '../const/const';
+
+const initialValue: ControlModel = {
+    value: DEFAULT_LINE_HEIGHT,
+    max: MAX_LINE_HEIGHT,
+    min: MIN_LINE_HEIGHT,
+    step: LINE_HEIGHT_STEP,
+};
+
+export const lineHeightStore = createControlStore(initialValue);