fix(workspace): sort daily memory by date and inline into file grid

- Sort daily memory list by filename (YYYY-MM-DD.md) instead of mtime
  so editing an older file no longer bumps it to the top
- Move daily memory card inline with workspace MD file buttons
- Shorten card description across all locales
- Defer file creation until user actually saves (no empty file on create)

src-tauri/src/commands/workspace.rs

@@ -106,8 +106,8 @@ pub async fn list_daily_memory_files() -> Result<Vec<DailyMemoryFileInfo>, Strin
         });
     }
 
-    // Sort by modified_at descending (newest first)
-    files.sort_by(|a, b| b.modified_at.cmp(&a.modified_at));
+    // Sort by filename descending (newest date first, YYYY-MM-DD.md)
+    files.sort_by(|a, b| b.filename.cmp(&a.filename));
 
     Ok(files)
 }