fix: auto-detect date format (DD/MM vs MM/DD) in CSV imports

Scans all date values in imported CSVs to determine whether the file
uses DD/MM/YYYY or MM/DD/YYYY format. When the format is ambiguous
(all day and month values are <= 12), shows an inline dropdown for the
user to choose. Bump version to 1.0.2.

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "ZeroClock",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "identifier": "com.localtimetracker.app",
   "build": {
     "beforeDevCommand": "npm run dev",