feat: password-gated recovery phrase display for HD wallets (closes #161)

src/popup/index.html

@@ -1098,6 +1098,52 @@
                 </button>
             </div>
 
+            <!-- ============ SHOW RECOVERY PHRASE ============ -->
+            <div id="view-show-phrase" class="view hidden">
+                <button
+                    id="btn-show-phrase-back"
+                    class="border border-border px-2 py-1 hover:bg-fg hover:text-bg cursor-pointer mb-2"
+                >
+                    &lt; Back
+                </button>
+                <h2 class="font-bold mb-1">Recovery Phrase</h2>
+                <p class="text-xs mb-3" id="show-phrase-wallet-name"></p>
+                <div
+                    class="text-xs mb-3 border border-border border-dashed p-2"
+                >
+                    Anyone who has these words can take every coin and token in
+                    this wallet, from any device, without your password. Never
+                    type them into a website and never show them to anyone.
+                </div>
+                <div
+                    id="show-phrase-flash"
+                    class="text-xs text-red-500 mb-2 min-h-[1.25rem]"
+                    style="visibility: hidden"
+                ></div>
+                <div id="show-phrase-password-section" class="mb-2">
+                    <label class="block mb-1">Password</label>
+                    <input
+                        type="password"
+                        id="show-phrase-password"
+                        class="border border-border p-1 w-full font-mono text-sm bg-bg text-fg"
+                        placeholder="Enter your password to continue"
+                    />
+                    <button
+                        id="btn-show-phrase-reveal"
+                        class="border border-border px-2 py-1 hover:bg-fg hover:text-bg cursor-pointer mt-2"
+                    >
+                        Reveal
+                    </button>
+                </div>
+                <div id="show-phrase-result" class="hidden">
+                    <div
+                        id="show-phrase-value"
+                        class="bg-danger-well rounded p-2 font-mono text-xs break-all cursor-pointer mb-1"
+                        title="Click to copy"
+                    ></div>
+                </div>
+            </div>
+
             <!-- ============ SETTINGS: ADD TOKEN ============ -->
             <div id="view-settings-addtoken" class="view hidden">
                 <button