feat(pwa): remove SvelteKitPWA plugin dependencies

Story 2: Remove SvelteKitPWA Plugin Dependencies
- Remove @vite-pwa/sveltekit from package.json dependencies
- Remove SvelteKitPWA plugin import and configuration from vite.config.ts
- Clean up plugin configuration including manifest, workbox, and devOptions
- Build process now works without plugin (service worker migration needed next)

Dependencies reduced by 309 packages
Build fails on workbox imports as expected - ready for Story 3

Refs: docs/plans/MigrateToNativeSvelteKitPWA.md

secrets/auth.json

@@ -5,7 +5,7 @@
       "value": "SDRORLyWEsWWty2ZoVGdER",
       "domain": ".instagram.com",
       "path": "/",
-      "expires": 1800936907.11208,
+      "expires": 1800937709.288068,
       "httpOnly": false,
       "secure": true,
       "sameSite": "Lax"
@@ -45,7 +45,7 @@
       "value": "59661903731",
       "domain": ".instagram.com",
       "path": "/",
-      "expires": 1774152907.11217,
+      "expires": 1774153709.288173,
       "httpOnly": false,
       "secure": true,
       "sameSite": "None"
@@ -55,7 +55,7 @@
       "value": "1280x720",
       "domain": ".instagram.com",
       "path": "/",
-      "expires": 1766981708,
+      "expires": 1766982509,
       "httpOnly": false,
       "secure": true,
       "sameSite": "Lax"
@@ -72,7 +72,7 @@
     },
     {
       "name": "rur",
-      "value": "\"CLN\\05459661903731\\0541797912907:01feab225fa86f00b6be5c6aad172798799c1d3bf81b1dcd57e6fc8313e49aa6b9899a74\"",
+      "value": "\"CLN\\05459661903731\\0541797913709:01fe9901d778068c1e12d177d918913a9e0ac541b803518c6f5cbdc54e966f512cdfd807\"",
       "domain": ".instagram.com",
       "path": "/",
       "expires": -1,
@@ -87,7 +87,7 @@
       "localStorage": [
         {
           "name": "chatd-deviceid",
-          "value": "959def05-6e66-4805-8316-d9fdd4cd4f95"
+          "value": "e55831d9-52f6-4b3b-a96a-cc3125af6b01"
         },
         {
           "name": "hb_timestamp",
@@ -95,11 +95,11 @@
         },
         {
           "name": "IGSession",
-          "value": "kc8y0b:1766378707663"
+          "value": "kc8y0b:1766379509344"
         },
         {
           "name": "mutex_polaris_banzai",
-          "value": "8ort9t:1766376779950"
+          "value": "yd2eoe:1766377710344"
         },
         {
           "name": "pixel_fire_ts",
@@ -111,7 +111,7 @@
         },
         {
           "name": "Session",
-          "value": "b8iamu:1766376942663"
+          "value": "nseh2f:1766377744344"
         },
         {
           "name": "has_interop_upgraded",
@@ -119,7 +119,7 @@
         },
         {
           "name": "mutex_banzai",
-          "value": "8ort9t:1766376779950"
+          "value": "yd2eoe:1766377710344"
         },
         {
           "name": "banzai:last_storage_flush",