chore(ios): add temporary Share Target debug panel (temporary)

Add a dedicated, temporary debug view for the iOS Share Target
investigation so native traces can be inspected without attaching Xcode.
Kept separate from the Notification/Notiwind test panel so it is easy to
remove once the investigation is complete.

The panel (src/views/ShareTargetDebugView.vue, route
/share-target-debug) has three buttons:
- Dump Native Traces: calls SharedImage.getShareExtensionTrace() and
  getAppLaunchTrace(), logs both in full (untruncated) between
  EXTENSION TRACE START/END and APP LAUNCH TRACE START/END markers, and
  shows them in read-only scrollable fields.
- Clear Share Extension Trace: clears the native log and the field.
- Clear App Launch Trace: clears the native log and the field.

Register the route alongside the existing /test debug route and link to
the panel from TestView. No share-target behavior changed; Android
untouched. All additions marked TEMPORARY SHARE TARGET DIAGNOSTICS.

src/router/index.ts

@@ -290,6 +290,12 @@ const routes: Array<RouteRecordRaw> = [
     name: "test",
     component: () => import("../views/TestView.vue"),
   },
+  // TEMPORARY SHARE TARGET DIAGNOSTICS
+  {
+    path: "/share-target-debug",
+    name: "share-target-debug",
+    component: () => import("../views/ShareTargetDebugView.vue"),
+  },
   {
     path: "/user-profile/:id?",
     name: "user-profile",

src/views/ShareTargetDebugView.vue

@@ -0,0 +1,187 @@
+<!-- TEMPORARY SHARE TARGET DIAGNOSTICS -->
+<!--
+  ShareTargetDebugView
+
+  Temporary, standalone debug panel for the iOS Share Target investigation.
+  Lets a tester dump and clear the native trace logs (share-extension-trace.log
+  and app-launch-trace.log) from the App Group container without attaching Xcode.
+
+  This entire view is temporary and intended to be deleted once the Share Target
+  investigation is complete. It does not change any share-target behavior.
+-->
+<template>
+  <QuickNav />
+
+  <!-- CONTENT -->
+  <section id="Content" class="p-6 pb-24 max-w-3xl mx-auto">
+    <!-- Sub View Heading -->
+    <div id="SubViewHeading" class="flex gap-4 items-start mb-8">
+      <h1 class="grow text-xl text-center font-semibold leading-tight">
+        Share Target Debug
+      </h1>
+
+      <!-- Back -->
+      <a
+        class="order-first text-lg text-center leading-none p-1"
+        @click="$router.go(-1)"
+      >
+        <font-awesome icon="chevron-left" class="block text-center w-[1em]" />
+      </a>
+    </div>
+
+    <p class="text-sm text-gray-600 mb-4">
+      Temporary diagnostics for the iOS Share Target investigation. Dumps the
+      native trace logs to the console and to the read-only fields below.
+    </p>
+
+    <!-- Action buttons -->
+    <div class="flex flex-wrap gap-2 mb-4">
+      <button :class="primaryButtonClasses" @click="dumpNativeTraces()">
+        Dump Native Traces
+      </button>
+      <button :class="warningButtonClasses" @click="clearExtensionTrace()">
+        Clear Share Extension Trace
+      </button>
+      <button :class="warningButtonClasses" @click="clearAppLaunchTrace()">
+        Clear App Launch Trace
+      </button>
+    </div>
+
+    <!-- Status message -->
+    <div
+      v-if="statusMessage"
+      class="mb-4 p-2 text-sm rounded-md bg-emerald-50 text-emerald-800 border border-emerald-200"
+    >
+      {{ statusMessage }}
+    </div>
+
+    <!-- Extension trace -->
+    <div class="mb-6">
+      <h2 class="text-lg font-semibold mb-2">Share Extension Trace</h2>
+      <textarea
+        :value="extensionTrace"
+        readonly
+        class="w-full h-64 p-2 border border-gray-300 rounded-md font-mono text-xs whitespace-pre overflow-auto"
+        placeholder="No extension trace loaded. Tap 'Dump Native Traces'."
+      ></textarea>
+    </div>
+
+    <!-- App launch trace -->
+    <div class="mb-6">
+      <h2 class="text-lg font-semibold mb-2">App Launch Trace</h2>
+      <textarea
+        :value="appLaunchTrace"
+        readonly
+        class="w-full h-64 p-2 border border-gray-300 rounded-md font-mono text-xs whitespace-pre overflow-auto"
+        placeholder="No app launch trace loaded. Tap 'Dump Native Traces'."
+      ></textarea>
+    </div>
+  </section>
+</template>
+
+<script lang="ts">
+import { Component, Vue } from "vue-facing-decorator";
+import { Router } from "vue-router";
+
+import QuickNav from "../components/QuickNav.vue";
+import { SharedImage } from "../plugins/SharedImagePlugin";
+import { logger } from "../utils/logger";
+
+/**
+ * TEMPORARY SHARE TARGET DIAGNOSTICS
+ *
+ * Dedicated debug panel for inspecting the iOS Share Target native traces.
+ * Temporary; remove once the Share Target investigation is complete.
+ */
+@Component({
+  components: {
+    QuickNav,
+  },
+})
+export default class ShareTargetDebugView extends Vue {
+  $router!: Router;
+
+  // TEMPORARY SHARE TARGET DIAGNOSTICS
+  extensionTrace = "";
+  // TEMPORARY SHARE TARGET DIAGNOSTICS
+  appLaunchTrace = "";
+  // TEMPORARY SHARE TARGET DIAGNOSTICS
+  statusMessage = "";
+
+  // TEMPORARY SHARE TARGET DIAGNOSTICS
+  get primaryButtonClasses(): string {
+    return "font-bold capitalize bg-slate-500 text-white px-3 py-2 rounded-md";
+  }
+
+  // TEMPORARY SHARE TARGET DIAGNOSTICS
+  get warningButtonClasses(): string {
+    return "font-bold capitalize bg-amber-600 text-white px-3 py-2 rounded-md";
+  }
+
+  // TEMPORARY SHARE TARGET DIAGNOSTICS
+  /**
+   * Retrieve both native traces, log them in full to the console, and display
+   * them in the read-only fields. Does not truncate either trace.
+   */
+  async dumpNativeTraces(): Promise<void> {
+    try {
+      const extensionResult = await SharedImage.getShareExtensionTrace();
+      const launchResult = await SharedImage.getAppLaunchTrace();
+
+      this.extensionTrace = extensionResult.trace;
+      this.appLaunchTrace = launchResult.trace;
+
+      // Log full (untruncated) traces to the console.
+      console.info("[ShareTarget] EXTENSION TRACE START");
+      console.info(extensionResult.trace);
+      console.info("[ShareTarget] EXTENSION TRACE END");
+      console.info("");
+      console.info("[ShareTarget] APP LAUNCH TRACE START");
+      console.info(launchResult.trace);
+      console.info("[ShareTarget] APP LAUNCH TRACE END");
+
+      this.statusMessage =
+        "Dumped native traces (see console and fields below).";
+    } catch (error) {
+      logger.error("[ShareTarget] Failed to dump native traces:", error);
+      this.statusMessage = `Failed to dump native traces: ${
+        error instanceof Error ? error.message : String(error)
+      }`;
+    }
+  }
+
+  // TEMPORARY SHARE TARGET DIAGNOSTICS
+  /**
+   * Clear the native Share Extension trace log and the displayed value.
+   */
+  async clearExtensionTrace(): Promise<void> {
+    try {
+      await SharedImage.clearShareExtensionTrace();
+      this.extensionTrace = "";
+      this.statusMessage = "Share Extension trace cleared.";
+    } catch (error) {
+      logger.error("[ShareTarget] Failed to clear extension trace:", error);
+      this.statusMessage = `Failed to clear Share Extension trace: ${
+        error instanceof Error ? error.message : String(error)
+      }`;
+    }
+  }
+
+  // TEMPORARY SHARE TARGET DIAGNOSTICS
+  /**
+   * Clear the native app launch trace log and the displayed value.
+   */
+  async clearAppLaunchTrace(): Promise<void> {
+    try {
+      await SharedImage.clearAppLaunchTrace();
+      this.appLaunchTrace = "";
+      this.statusMessage = "App Launch trace cleared.";
+    } catch (error) {
+      logger.error("[ShareTarget] Failed to clear app launch trace:", error);
+      this.statusMessage = `Failed to clear App Launch trace: ${
+        error instanceof Error ? error.message : String(error)
+      }`;
+    }
+  }
+}
+</script>

src/views/TestView.vue

@@ -112,6 +112,21 @@
       </router-link>
     </div>
 
+    <!-- TEMPORARY SHARE TARGET DIAGNOSTICS -->
+    <div class="mt-8">
+      <h2 class="text-xl font-bold mb-4">Share Target Diagnostics</h2>
+      <p class="text-sm text-gray-600 mb-3">
+        Temporary debug panel for the iOS Share Target investigation (dump/clear
+        native traces).
+      </p>
+      <router-link
+        :to="{ name: 'share-target-debug' }"
+        class="block w-full text-center text-md bg-gradient-to-b from-slate-400 to-slate-700 shadow-[inset_0_-1px_0_rgba(0,0,0,0.5)] text-white px-1.5 py-2 rounded-md"
+      >
+        Open Share Target Debug Panel
+      </router-link>
+    </div>
+
     <!-- URL Flow Testing Section -->
     <div class="mt-8">
       <h2 class="text-xl font-bold mb-4">URL Flow Testing</h2>