Stricter compilation rules, better linting

src/components/Space.tsx

@@ -49,7 +49,9 @@ export function Space() {
 
   // Drag in empty space - rectangle selection
   const handleMouseDown = (e: React.MouseEvent) => {
-    if (e.detail === 2) return // Ignore double-click
+    if (e.detail === 2) {
+return
+} // Ignore double-click
     
     const rect = e.currentTarget.getBoundingClientRect()
     const x = e.clientX - rect.left
@@ -61,10 +63,14 @@ export function Space() {
   }
 
   const handleMouseMove = (e: MouseEvent) => {
-    if (!isSelecting) return
+    if (!isSelecting) {
+return
+}
     
     const spaceElement = document.querySelector('[data-space-canvas]') as HTMLElement
-    if (!spaceElement) return
+    if (!spaceElement) {
+return
+}
     
     const rect = spaceElement.getBoundingClientRect()
     const x = e.clientX - rect.left
@@ -74,13 +80,17 @@ export function Space() {
   }
 
   const handleMouseUp = (e: MouseEvent) => {
-    if (!isSelecting) return
+    if (!isSelecting) {
+return
+}
     
     setIsSelecting(false)
     
     // Get final mouse position directly from event
     const spaceElement = document.querySelector('[data-space-canvas]') as HTMLElement
-    if (!spaceElement) return
+    if (!spaceElement) {
+return
+}
     
     const rect = spaceElement.getBoundingClientRect()
     const finalX = e.clientX - rect.left
@@ -114,13 +124,16 @@ export function Space() {
         document.removeEventListener('mouseup', handleMouseUp)
       }
     }
+    return undefined
   }, [isSelecting, selectionStart])
 
   // Keyboard shortcuts
   useEffect(() => {
     const handleKeyDown = (e: KeyboardEvent) => {
       // Don't handle shortcuts if editing a note, navigation console or welcome modal is open
-      if ($editingNoteId || showNavigationConsole || showWelcomeModal) return
+      if ($editingNoteId || showNavigationConsole || showWelcomeModal) {
+return
+}
       
       if (e.key === ':' && !e.shiftKey) {
         e.preventDefault()