Update software URLs

Since the output of the modded files is identical for each version, the
fact that these were swapped for Clara/Libra did not matter, but it's
been amended now.

I've added patches for older devices on 4.38, but this isn't currently
usable in the UI as I've not set up the `downloads.json` file with
correct and up-to-date URLs for these devices.

I'm not even sure I want to actually support this, as the SD card
storage in these older devices is less reliable, which means that
applying custom patches is a little bit more risky in my eyes.

kobopatch-wasm/integration_test.go

@@ -33,7 +33,7 @@ func TestIntegrationPatch(t *testing.T) {
 	}
 
 	// Read patch files from the patches zip.
-	patchesZipPath := "../web/src/patches/patches_4.45.23646.zip"
+	patchesZipPath := "../web/src/patches/patches_4.45.zip"
 	patchesZip, err := os.ReadFile(patchesZipPath)
 	if err != nil {
 		t.Fatalf("could not read patches zip: %v", err)

web/src/patches/downloads.json

@@ -1,8 +1,9 @@
 {
+  "_source": "https://help.kobo.com/hc/en-us/articles/35059171032727-Manually-Updating-your-Kobo-eReader-device-Firmware",
   "4.45.23646": {
-    "N428": "https://ereaderfiles.kobo.com/firmwares/kobo13/Mar2026/kobo-update-4.45.23646.zip",
+    "N428": "https://ereaderfiles.kobo.com/firmwares/kobo12/Mar2026/kobo-update-4.45.23646.zip",
-    "N365": "https://ereaderfiles.kobo.com/firmwares/kobo12/Mar2026/kobo-update-4.45.23646.zip",
+    "N365": "https://ereaderfiles.kobo.com/firmwares/kobo13/Mar2026/kobo-update-4.45.23646.zip",
-    "N367": "https://ereaderfiles.kobo.com/firmwares/kobo12/Mar2026/kobo-update-4.45.23646.zip",
+    "N367": "https://ereaderfiles.kobo.com/firmwares/kobo13/Mar2026/kobo-update-4.45.23646.zip",
     "P365": "https://ereaderfiles.kobo.com/firmwares/kobo14/Mar2026/kobo-update-4.45.23646.zip"
   }
 }

web/src/patches/index.json

@@ -1,7 +1,12 @@
 [
     {
-        "filename": "patches_4.45.23646.zip",
+        "filename": "patches_4.45.zip",
         "versions": ["4.45.23646"],
         "date": "03-2026"
+    },
+    {
+        "filename": "patches_4.38.zip",
+        "versions": [],
+        "date": "08-2025"
     }
 ]