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/mining_stats.cpp

@@ -312,11 +312,11 @@ static void RenderLeftPoolCard(App* app, const WalletState& state, ImDrawList* d
                                  isCurrent ? Success() : OnSurfaceDisabled());
 
             const float textY = rMin.y + (listRowH - capFont->LegacySize) * 0.5f;
-            // Show the short host label (the narrow card can't fit host:port); the
-            // full stratum URL is in the hover tooltip.
-            cdl->AddText(capFont, capFont->LegacySize, ImVec2(rMin.x + 16 * dp, textY),
-                         isCurrent ? Primary() : OnSurface(), kp.label.c_str());
 
+            // Build the right-side "<hashrate>  N% fee" run first so we know its width
+            // and can bound (and ellipsis-truncate) the left host label to avoid a
+            // collision — both text runs grow ~1.5x at font_scale 1.5 while the card
+            // width barely does.
             char right[64];
             std::string hrStr = haveHr ? FormatHashrate(it->second.hashrateHs) : std::string("—");
             // Prefer the live fee the pool reports; fall back to the compile-time
@@ -331,6 +331,16 @@ static void RenderLeftPoolCard(App* app, const WalletState& state, ImDrawList* d
             else
                 snprintf(right, sizeof(right), "%s", hrStr.c_str());
             ImVec2 rSz = capFont->CalcTextSizeA(capFont->LegacySize, FLT_MAX, 0, right);
+
+            // Show the short host label (the narrow card can't fit host:port); the
+            // full stratum URL is in the hover tooltip. Truncate it to the gap left
+            // of the right-side run so a long hostname can't overlap the hashrate.
+            const float labelX = rMin.x + 16 * dp;
+            const float labelMaxW = (rMax.x - rSz.x - 6 * dp - gap) - labelX;
+            std::string label = TruncateToWidth(kp.label, capFont, capFont->LegacySize, labelMaxW);
+            cdl->AddText(capFont, capFont->LegacySize, ImVec2(labelX, textY),
+                         isCurrent ? Primary() : OnSurface(), label.c_str());
+
             cdl->AddText(capFont, capFont->LegacySize,
                          ImVec2(rMax.x - rSz.x - 6 * dp, textY), OnSurfaceMedium(), right);