fix(ui): scale unscaled geometry at HiDPI — inputs, send progress cards, chat/pool overlaps, peer rows

At font_scale 1.5 ~13 sites read absolute geometry (schema .size/.width) straight
into ImGui without ×dpiScale(), so they stayed native-size while the font grew and
overlapped/clipped real text or money:

- Shield/Merge fee + UTXO inputs, Request Payment amount, Block Info height input:
  ×dpiScale() so the value no longer clips (e.g. 0.00010000 -> 0.00010).
- Send: the confirm-popup Amount Details divider (floored the row step at the scaled
  caption height so it no longer strikes the Fee row), the tx-progress error and
  sending/success cards, and the zero-balance CTA button — all ×dp.
- Mining pool row: ellipsis-truncate the hostname so it can't collide with the
  right-aligned hashrate.
- Chat conversation list: scale the pane-width clamp AND clip the peer name to the
  column left of the timestamp (measure-then-clip) so name and time never overlap.
- Explorer block-detail label column, Peers row offsets, and DialogConfirmFooter
  button height — ×dp.

transaction_details keeps its negative fill-sentinel widths unscaled (a content
margin, not raw px). Verified at font_scale 1.5 across full-node + Lite + Windows
(ctest green) and an adversarial diff review (three wrong-scale regressions fixed).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/ui/windows/transaction_details_dialog.cpp

@@ -121,7 +121,7 @@ void TransactionDetailsDialog::render(App* app)
         char txid_buf[128];
         strncpy(txid_buf, tx.txid.c_str(), sizeof(txid_buf) - 1);
         txid_buf[sizeof(txid_buf) - 1] = '\0';
-        ImGui::SetNextItemWidth(txidInput.width);
+        ImGui::SetNextItemWidth(txidInput.width);  // negative = fill, reserving |width| px for the Copy button (a content-region margin, not raw px — must NOT be dpi-scaled)
         ImGui::InputText("##TxID", txid_buf, sizeof(txid_buf), ImGuiInputTextFlags_ReadOnly);
         ImGui::SameLine();
         if (material::StyledButton("Copy##TxID", ImVec2(copyBtn.width, 0), S.resolveFont(copyBtn.font))) {
@@ -139,13 +139,14 @@ void TransactionDetailsDialog::render(App* app)
                 char addr_buf[512];
                 strncpy(addr_buf, tx.address.c_str(), sizeof(addr_buf) - 1);
                 addr_buf[sizeof(addr_buf) - 1] = '\0';
+                // width is a negative fill-with-right-margin sentinel — keep unscaled; only height is raw px.
                 ImGui::InputTextMultiline("##Address", addr_buf, sizeof(addr_buf),
-                                          ImVec2(addrInput.width, addrInput.height > 0 ? addrInput.height : 50), ImGuiInputTextFlags_ReadOnly);
+                                          ImVec2(addrInput.width, (addrInput.height > 0 ? addrInput.height : 50) * Layout::dpiScale()), ImGuiInputTextFlags_ReadOnly);
             } else {
                 char addr_buf[128];
                 strncpy(addr_buf, tx.address.c_str(), sizeof(addr_buf) - 1);
                 addr_buf[sizeof(addr_buf) - 1] = '\0';
-                ImGui::SetNextItemWidth(addrInput.width);
+                ImGui::SetNextItemWidth(addrInput.width);  // negative fill sentinel — must NOT be dpi-scaled
                 ImGui::InputText("##Address", addr_buf, sizeof(addr_buf), ImGuiInputTextFlags_ReadOnly);
             }
             ImGui::SameLine();