Remove dead CSS: delete unused compact-widgets.css, deduplicate globals.css

- Delete compact-widgets.css (378 lines, never imported anywhere)
- Remove duplicate singleNoteWidget block in globals.css (exact copy-paste)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/globals.css

@@ -1361,54 +1361,6 @@ button:disabled {
   }
 }
 
-.singleNoteWidget {
-  height: 100%;
-  display: grid;
-  grid-template-rows: minmax(0, 1fr) auto;
-  gap: 10px;
-}
-
-.singleNoteTextarea {
-  height: 100%;
-  min-height: 0;
-  resize: none;
-}
-
-.singleNoteWidget .todoEditor {
-  min-height: 0;
-  overflow: auto;
-}
-
-.singleNoteWidget .noteDeleteButton {
-  justify-self: start;
-}
-
-.singleNoteWidget .todoTask {
-  grid-template-columns: auto minmax(0, 1fr) auto;
-}
-
-@container (max-width: 240px) {
-  .singleNoteWidget .todoTask {
-    grid-template-columns: auto minmax(0, 1fr);
-  }
-
-  .singleNoteWidget .todoDeleteButton {
-    grid-column: 1 / -1;
-  }
-}
-
-@container (max-height: 160px) {
-  .singleNoteWidget {
-    gap: 6px;
-  }
-
-  .singleNoteWidget .noteDeleteButton,
-  .singleNoteWidget .todoDeleteButton,
-  .singleNoteWidget .todoAddForm {
-    display: none;
-  }
-}
-
 .todoAddForm {
   grid-template-columns: minmax(0, 1fr) 40px;
 }