fix: restore test-used functions, silence tx.Rollback closed errors, prune knip dead code

Restore processImage (images.go) and nonDepositPaymentType (handlers.go) with //nolint:unused — used in test files.
Fix 97 tx.Rollback defers to silently discard expected "tx is closed" error after commit.
Frontend: remove 44 unused shadcn-svelte files, 2 dead components, 9 stale npm deps, prune unused exports.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

frontend/package.json

@@ -21,7 +21,6 @@
 		"@eslint/js": "^9.22.0",
 		"@internationalized/date": "^3.11.0",
 		"@lucide/svelte": "^1.17.0",
-		"@sveltejs/adapter-auto": "^6.0.0",
 		"@sveltejs/adapter-static": "^3.0.9",
 		"@sveltejs/kit": "^2.22.0",
 		"@sveltejs/vite-plugin-svelte": "^6.2.4",
@@ -33,29 +32,23 @@
 		"eslint": "^9.22.0",
 		"eslint-config-prettier": "^10.0.1",
 		"eslint-plugin-svelte": "^3.0.0",
-		"formsnap": "^2.0.1",
 		"globals": "^17.3.0",
-		"jsdom": "^29.1.1",
 		"mode-watcher": "^1.1.0",
 		"prettier": "^3.8.1",
 		"prettier-plugin-svelte": "^3.5.0",
 		"prettier-plugin-tailwindcss": "^0.7.2",
-		"runed": "^0.37.1",
 		"shadcn-svelte": "^1.1.1",
 		"svelte": "^5.0.0",
 		"svelte-check": "^4.4.3",
 		"svelte-easy-crop": "^5.0.0",
 		"svelte-sonner": "^1.0.7",
-		"svelte-toolbelt": "^0.10.6",
-		"sveltekit-superforms": "^2.27.1",
 		"tailwind-merge": "^3.5.0",
 		"tailwind-variants": "^3.2.2",
 		"tailwindcss": "^4.2.0",
 		"tw-animate-css": "^1.4.0",
 		"typescript": "^5.9.3",
 		"typescript-eslint": "^8.20.0",
-		"vite": "^7.0.4",
-		"vitest": "^4.1.9"
+		"vite": "^7.0.4"
 	},
 	"dependencies": {
 		"@discourse/jxl": "^1.3.0",
@@ -65,8 +58,6 @@
 		"@zxcvbn-ts/core": "^3.0.4",
 		"@zxcvbn-ts/language-common": "^3.0.4",
 		"@zxcvbn-ts/language-en": "^3.0.2",
-		"cropperjs": "^1.6.2",
-		"esbuild": "^0.28.1",
 		"heic2any": "^0.0.4",
 		"maplibre-gl": "^5.24.0"
 	}