feat(ui): profile picker + per-profile vocabulary; transcribe invokes carry profileId; drop buildInitialPrompt

src/lib/pages/FilesPage.svelte

@@ -4,6 +4,7 @@
   import { invoke } from "@tauri-apps/api/core";
   import { listen } from "@tauri-apps/api/event";
   import { settings, addToHistory } from "$lib/stores/page.svelte.js";
+  import { profilesStore } from "$lib/stores/profiles.svelte.ts";
   import Card from "$lib/components/Card.svelte";
   import EmptyState from "$lib/components/EmptyState.svelte";
   import { exportTranscript } from "$lib/utils/export.js";
@@ -76,6 +77,7 @@
           path,
           language: settings.language,
           initialPrompt: "",
+          profileId: profilesStore.activeProfileId,
           removeFillers: settings.removeFillers,
           britishEnglish: settings.britishEnglish,
           antiHallucination: settings.antiHallucination,