chore: remove axios + deprecated electron_native.js; track lucide-svelte migration

- Uninstall axios — only consumer was electron_native.js (legacy V2 file)
- Delete electron_native.js — deprecated 2026-02-10, no active imports; replaced
  by aether_app_native_electron repo + electron_relay.ts contextBridge
- Add TODO: migrate remaining lucide-svelte → @lucide/svelte (5 files) then uninstall

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

package.json

@@ -105,7 +105,6 @@
         "@lucide/svelte": "^0.*.0",
         "@popperjs/core": "^2.11.0",
         "@tailwindcss/vite": "^4.1.10",
-        "axios": "^1.7.0",
         "dayjs": "^1.11.10",
         "dexie": "^4.0.0",
         "flowbite-svelte": "^1.28.1",