Extend local inscription lab with MIME bodies and parent provenance

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         <div class="wallet-footer"><label class="file-button" for="load-wallet">↑ Load test wallet or lab backup</label><input id="load-wallet" type="file" accept=".json,application/json"><p class="muted">Saved on this device. A wallet backup contains its test key; a lab backup also preserves the chain.</p></div>
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       <article class="panel"><div class="panel-title"><span class="step">02</span><h2>Make some blocks</h2></div><p>Skip the faucet queue. Every block gives you <strong>50 fake BTC</strong>, ready to use immediately.</p><div class="chain-stats"><div><span class="label">BLOCK HEIGHT</span><strong id="height">0</strong></div><div><span class="label">PENDING TXS</span><strong id="pending">0</strong></div></div><button id="mine" class="primary" disabled>Mine a block <span>+</span></button><p class="muted">Mining also confirms your pending inscriptions.</p></article>
-      <article class="panel inscribe"><div class="panel-title"><span class="step">03</span><h2>Leave a little something</h2><span class="tag">TEXT INSCRIPTION</span></div><label for="payload">What will you put on your chain?</label><textarea id="payload" placeholder="Hello, little Bitcoin universe…" rows="3" disabled></textarea><div class="compose-footer"><span id="byte-count" class="muted">0 / 280 UTF-8 bytes</span><button id="review" disabled>Review inscription ↗</button></div>
-        <div id="review-panel" hidden><h3>Review before signing</h3><pre id="review-text"></pre><p>Two transactions: commit + reveal. <strong>1,000 fake sats</strong> in fees; <strong>1,000 fake sats</strong> reserved in your collectible. It returns to your current wallet.</p><p class="muted">The next button signs both transactions locally with this test wallet and submits them to your private chain.</p><button id="sign" class="primary">Sign & inscribe</button> <button id="cancel-review" class="quiet">Cancel</button></div>
+      <article class="panel inscribe"><div class="panel-title"><span class="step">03</span><h2>Leave a little something</h2><span class="tag">INSCRIPTION LAB</span></div><label for="mime-type">Content type</label><select id="mime-type"></select><label for="body-file">Or upload a local file (16 KiB maximum)</label><input id="body-file" type="file"><label for="parent">Parent inscription (optional, immutable)</label><select id="parent"><option value="">No parent</option></select><label for="payload">What will you put on your chain?</label><textarea id="payload" placeholder="Hello, little Bitcoin universe…" rows="3" disabled></textarea><div class="compose-footer"><span id="byte-count" class="muted">0 / 16384 bytes</span><button id="review" disabled>Review inscription ↗</button></div>
+        <div id="review-panel" hidden><h3>Review before signing</h3><div id="review-preview"></div><pre id="review-text"></pre><p id="review-parent"></p><p>Two transactions: commit + reveal. <strong>1,000 fake sats</strong> in fees; <strong>1,000 fake sats</strong> reserved in your collectible. It returns to your current wallet.</p><p class="muted">The next button signs both transactions locally with this test wallet and submits them to your private chain.</p><button id="sign" class="primary">Sign & inscribe</button> <button id="cancel-review" class="quiet">Cancel</button></div>
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     <section class="collection-section"><div class="section-title"><div><p class="eyebrow">04 / THE THINGS YOU MADE</p><h2>Your inscriptions <span id="collection-count">0</span></h2></div><span class="muted">Owned by this wallet</span></div><div id="collectibles" class="collectibles"><p class="empty">Your first inscription belongs here.<br><span>Fund your wallet, write some text, and make it yours.</span></p></div></section>
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-    <details class="about"><summary>Under the hood & attribution</summary><p>Real serialized Bitcoin transactions, Schnorr signatures and Taproot commit/reveal scripts, on a deliberately simplified local UTXO chain. No proof of work, Bitcoin consensus, peer network, public broadcast, or production custody. Collectible outputs cannot be spent in v0.</p><p>Built from and inspired by <a href="https://github.com/supertestnet/testnet_generator">Supertestnet’s testnet_generator</a>, <a href="https://github.com/supertestnet/inscriptions-online">inscriptions-online</a>, and <a href="https://github.com/supertestnet/vanilla-js-browser-wallet">vanilla-js-browser-wallet</a>. <a href="https://github.com/supertestnet/node_faker">node_faker</a> was evaluated for future RPC compatibility.</p><p>Transaction library: <a href="https://github.com/cmdruid/tapscript">tapscript by Christopher Scott</a> (<a href="/licenses/tapscript.txt">CC-BY-1.0</a>). <a href="/licenses/supertestnet-CC0.txt">Supertestnet CC0 license</a> · <a href="/licenses/noble-curves.txt">noble-curves license</a> · <a href="/licenses/noble-hashes.txt">noble-hashes license</a>.</p></details>
+    <details class="about"><summary>Under the hood & attribution</summary><p>Real serialized Bitcoin transactions, Schnorr signatures and Taproot commit/reveal scripts, on a deliberately simplified local UTXO chain. No proof of work, Bitcoin consensus, peer network, public broadcast, or production custody. Collectibles can only be spent by explicit child reveals that preserve the parent in the same wallet.</p><p>Built from and inspired by <a href="https://github.com/supertestnet/testnet_generator">Supertestnet’s testnet_generator</a>, <a href="https://github.com/supertestnet/inscriptions-online">inscriptions-online</a>, and <a href="https://github.com/supertestnet/vanilla-js-browser-wallet">vanilla-js-browser-wallet</a>. <a href="https://github.com/supertestnet/node_faker">node_faker</a> was evaluated for future RPC compatibility.</p><p>Transaction library: <a href="https://github.com/cmdruid/tapscript">tapscript by Christopher Scott</a> (<a href="/licenses/tapscript.txt">CC-BY-1.0</a>). <a href="/licenses/supertestnet-CC0.txt">Supertestnet CC0 license</a> · <a href="/licenses/noble-curves.txt">noble-curves license</a> · <a href="/licenses/noble-hashes.txt">noble-hashes license</a>.</p></details>
     <footer><span>SMALL CHAIN. BIG POSSIBILITIES.</span><button id="reset" class="quiet danger">Reset local lab</button></footer>
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