Fix TypeScript errors blocking Docker build

- Fix Authentik button type casting issue in login page
  * Use exported signIn instead of authClient type assertion
  * Add proper error handling for OAuth calls

- Fix image MIME type handling in import-photo.ts
  * Convert base64 to data URL format for AI SDK compatibility

- Fix type annotations in auth/server.ts changeEmail handler
  * Add explicit type annotation for destructured parameters

These TypeScript errors were preventing 'pnpm build' from completing
during Docker image build process.

apps/web/lib/ai/features/import-photo.ts

@@ -40,6 +40,9 @@ export async function importFromPhoto(
 ): Promise<ImportedRecipe> {
   const model = resolveModel(config);
 
+  // Create a data URL from base64
+  const imageDataUrl = `data:${mimeType};base64,${imageBase64}`;
+
   const { object } = await generateObject({
     model,
     schema: ImportedRecipeSchema,
@@ -49,7 +52,7 @@ export async function importFromPhoto(
       {
         role: "user",
         content: [
-          { type: "image", image: imageBase64, mimeType },
+          { type: "image", image: imageDataUrl },
           { type: "text", text: "Extract the complete recipe from this image." },
         ],
       },