Split popup into one file per view

popup/index.js reduced to ~75 lines: loads state, builds a
shared context object, initializes all views, shows first screen.

Each view in popup/views/:
  helpers.js      — $(), showError, hideError, showView
  welcome.js      — welcome screen
  addWallet.js    — unified create/import recovery phrase
  importKey.js    — private key import
  home.js         — wallet list, total value, address derivation
  addressDetail.js — address view, token list, QR, copy
  send.js         — send form, ENS resolution, tx broadcast
  receive.js      — QR + copy
  addToken.js     — token lookup, common token picker
  settings.js     — RPC endpoint
  approval.js     — dApp approval (stub)

Views communicate via a ctx object with shared callbacks
(renderWalletList, showAddressDetail, doRefreshAndRender, etc).

src/popup/views/send.js

@@ -0,0 +1,93 @@
+const { parseEther } = require("ethers");
+const { $, showError } = require("./helpers");
+const { state } = require("../../shared/state");
+const { getSignerForAddress } = require("../../shared/wallet");
+const { decryptWithPassword } = require("../../shared/vault");
+const {
+    getProvider,
+    invalidateBalanceCache,
+} = require("../../shared/balances");
+
+function init(ctx) {
+    $("btn-send-confirm").addEventListener("click", async () => {
+        const to = $("send-to").value.trim();
+        const amount = $("send-amount").value.trim();
+        if (!to) {
+            showError("send-status", "Please enter a recipient address.");
+            $("send-status").classList.remove("hidden");
+            return;
+        }
+        if (!amount || isNaN(parseFloat(amount)) || parseFloat(amount) <= 0) {
+            showError("send-status", "Please enter a valid amount.");
+            $("send-status").classList.remove("hidden");
+            return;
+        }
+        let resolvedTo = to;
+        if (to.includes(".") && !to.startsWith("0x")) {
+            const statusEl = $("send-status");
+            statusEl.textContent = "Resolving " + to + "...";
+            statusEl.classList.remove("hidden");
+            try {
+                const provider = getProvider(state.rpcUrl);
+                const resolved = await provider.resolveName(to);
+                if (!resolved) {
+                    showError("send-status", "Could not resolve " + to);
+                    return;
+                }
+                resolvedTo = resolved;
+            } catch (e) {
+                showError("send-status", "Failed to resolve ENS name.");
+                return;
+            }
+        }
+        const password = $("send-password").value;
+        if (!password) {
+            showError("send-status", "Please enter your password.");
+            $("send-status").classList.remove("hidden");
+            return;
+        }
+        const wallet = state.wallets[state.selectedWallet];
+        let decryptedSecret;
+        const statusEl = $("send-status");
+        statusEl.textContent = "Decrypting...";
+        statusEl.classList.remove("hidden");
+        try {
+            decryptedSecret = await decryptWithPassword(
+                wallet.encryptedSecret,
+                password,
+            );
+        } catch (e) {
+            showError("send-status", "Wrong password.");
+            return;
+        }
+        statusEl.textContent = "Sending...";
+        try {
+            const signer = getSignerForAddress(
+                wallet,
+                state.selectedAddress,
+                decryptedSecret,
+            );
+            const provider = getProvider(state.rpcUrl);
+            const connectedSigner = signer.connect(provider);
+            const tx = await connectedSigner.sendTransaction({
+                to: resolvedTo,
+                value: parseEther(amount),
+            });
+            statusEl.textContent = "Sent. Waiting for confirmation...";
+            const receipt = await tx.wait();
+            statusEl.textContent =
+                "Confirmed in block " +
+                receipt.blockNumber +
+                ". Tx: " +
+                receipt.hash;
+            invalidateBalanceCache();
+            ctx.doRefreshAndRender();
+        } catch (e) {
+            statusEl.textContent = "Failed: " + (e.shortMessage || e.message);
+        }
+    });
+
+    $("btn-send-back").addEventListener("click", ctx.showAddressDetail);
+}
+
+module.exports = { init };