cleanup(legibility): repo hygiene — untrack artifacts, update gitignore

CLEANUP-4 (#415):

Untracked from git (files stay on disk where appropriate):
- frontend/e2e/.auth/user.json — dev credential, already gitignored in
  frontend/.gitignore; git rm --cached so the rule takes effect
- proofshot-artifacts/ (44 files, ~7.6MB) — browser verification
  screenshots committed by mistake; added root .gitignore entry
- frontend/.svelte-kit.old/ — stale type stub from stammbaum route
  rename; deleted from disk
- frontend/test-results.locked/ — Playwright E2E artifacts; deleted
  from disk
- node_modules/.vite/vitest/.../results.json — Vite test cache committed
  by mistake

Deleted from repo:
- package.json / package-lock.json at root (3 testing-library devDeps
  with no justification for living outside frontend/)

.gitignore additions:
- root: proofshot-artifacts/, node_modules/
- frontend: **/test-results.locked/, **/.svelte-kit.old/

After this commit, git status on a fresh clone shows zero unexpected
items (only docs/superpowers/ and familienarchiv-408/ remain untracked,
both pre-existing).

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

frontend/.gitignore

@@ -36,6 +36,10 @@ src/lib/paraglide_bak*
 e2e/.auth/
 
 **/test-results/**
+**/test-results.locked/
+
+# Stale SvelteKit build artifacts
+**/.svelte-kit.old/
 
 # Proofshot browser verification artifacts
 proofshot-artifacts/

frontend/.svelte-kit.old/types/src/routes/.stammbaum-stale/$types.d.ts

@@ -1,24 +0,0 @@
-import type * as Kit from '@sveltejs/kit';
-
-type Expand<T> = T extends infer O ? { [K in keyof O]: O[K] } : never;
-type MatcherParam<M> = M extends (param : string) => param is (infer U extends string) ? U : string;
-type RouteParams = {  };
-type RouteId = '/stammbaum';
-type MaybeWithVoid<T> = {} extends T ? T | void : T;
-export type RequiredKeys<T> = { [K in keyof T]-?: {} extends { [P in K]: T[K] } ? never : K; }[keyof T];
-type OutputDataShape<T> = MaybeWithVoid<Omit<App.PageData, RequiredKeys<T>> & Partial<Pick<App.PageData, keyof T & keyof App.PageData>> & Record<string, any>>
-type EnsureDefined<T> = T extends null | undefined ? {} : T;
-type OptionalUnion<U extends Record<string, any>, A extends keyof U = U extends U ? keyof U : never> = U extends unknown ? { [P in Exclude<A, keyof U>]?: never } & U : never;
-export type Snapshot<T = any> = Kit.Snapshot<T>;
-type PageServerParentData = EnsureDefined<import('../$types.js').LayoutServerData>;
-type PageParentData = EnsureDefined<import('../$types.js').LayoutData>;
-
-export type PageServerLoad<OutputData extends OutputDataShape<PageServerParentData> = OutputDataShape<PageServerParentData>> = Kit.ServerLoad<RouteParams, PageServerParentData, OutputData, RouteId>;
-export type PageServerLoadEvent = Parameters<PageServerLoad>[0];
-export type ActionData = unknown;
-export type PageServerData = Expand<OptionalUnion<EnsureDefined<Kit.LoadProperties<Awaited<ReturnType<typeof import('../../../../../src/routes/stammbaum/+page.server.js').load>>>>>>;
-export type PageData = Expand<Omit<PageParentData, keyof PageServerData> & EnsureDefined<PageServerData>>;
-export type Action<OutputData extends Record<string, any> | void = Record<string, any> | void> = Kit.Action<RouteParams, OutputData, RouteId>
-export type Actions<OutputData extends Record<string, any> | void = Record<string, any> | void> = Kit.Actions<RouteParams, OutputData, RouteId>
-export type PageProps = { params: RouteParams; data: PageData; form: ActionData }
-export type RequestEvent = Kit.RequestEvent<RouteParams, RouteId>;

frontend/e2e/.auth/user.json

@@ -1,25 +0,0 @@
-{
-  "cookies": [
-    {
-      "name": "PARAGLIDE_LOCALE",
-      "value": "de",
-      "domain": "localhost",
-      "path": "/",
-      "expires": 1812352142.362504,
-      "httpOnly": false,
-      "secure": false,
-      "sameSite": "Lax"
-    },
-    {
-      "name": "auth_token",
-      "value": "Basic%20YWRtaW5AZmFtaWx5YXJjaGl2ZS5sb2NhbDphZG1pbjEyMw%3D%3D",
-      "domain": "localhost",
-      "path": "/",
-      "expires": 1777878542.943668,
-      "httpOnly": true,
-      "secure": false,
-      "sameSite": "Strict"
-    }
-  ],
-  "origins": []
-}

frontend/test-results.locked/e2e/.last-run.json

@@ -1,6 +0,0 @@
-{
-  "status": "failed",
-  "failedTests": [
-    "17e3fe6f4d9d8bd79c6b-60f085b113a677673906"
-  ]
-}