Fix warnings and update tracability

src/lib/components/sessions/CastButton.svelte

@@ -1,3 +1,4 @@
+<!-- TRACES: UR-010 | DR-037 -->
 <script lang="ts">
   import { onMount, onDestroy } from "svelte";
   import { invoke } from "@tauri-apps/api/core";

src/lib/components/sessions/RemoteControls.svelte

@@ -1,3 +1,4 @@
+<!-- TRACES: UR-010 | JA-022, JA-023, JA-024, JA-026 | DR-037 -->
 <script lang="ts">
   import type { Session } from "$lib/api/types";
   import { sessions } from "$lib/stores";

src/lib/components/sessions/SessionCard.svelte

@@ -1,3 +1,4 @@
+<!-- TRACES: UR-010 | DR-037 -->
 <script lang="ts">
   import type { Session } from "$lib/api/types";
   import CachedImage from "$lib/components/common/CachedImage.svelte";

src/lib/components/sessions/SessionPickerModal.svelte

@@ -1,3 +1,4 @@
+<!-- TRACES: UR-010 | JA-021, JA-025 | DR-037 -->
 <script lang="ts">
   import { sessions, controllableSessions, selectedSession } from "$lib/stores";
   import { playbackMode, isTransferring, transferError } from "$lib/stores/playbackMode";
@@ -86,7 +87,7 @@
   <div
     class="fixed inset-0 bg-black/60 z-50 flex items-end sm:items-center justify-center p-0 sm:p-4"
     onclick={handleBackdropClick}
-    onkeydown={(e) => { if (e.key === 'Escape') handleBackdropClick(); }}
+    onkeydown={(e) => { if (e.key === 'Escape' && onClose) onClose(); }}
     role="dialog"
     aria-modal="true"
     aria-labelledby="session-picker-title"

src/lib/components/sessions/SessionsList.svelte

@@ -1,3 +1,4 @@
+<!-- TRACES: UR-010 | JA-021 | DR-037 -->
 <script lang="ts">
   import { sessions, controllableSessions } from "$lib/stores";
   import SessionCard from "./SessionCard.svelte";