feat(ui): in-app FAQ, DPI-scaling audit fixes, mining/stratum polish + localize strings

Bundles the session's UI work (the touched files carry several of these
changes together, so they are committed as one coherent UI batch):

- FAQ: new RenderFaqDialog + data-driven faq_content, opened from a
  status-bar "?" (and the Windows title bar), styled like the Wallets
  modal with search, Wallet/Daemon tabs, and smooth scroll.
- DPI/font-scale audit: multiply hand-drawn absolute geometry by
  Layout::dpiScale() across ~30 files so nothing renders native-size at
  HiDPI / font_scale 1.5 (verified with a full sweep at 1.5x).
- Mining: chart now fills the horizontal space; thread stepper +/- buttons
  match the input-box height; move the stratum-host toggle into
  Node & Security (v1.3.0+).
- Settings: fix the auto-shield status text overlapping the grid.
- Sidebar: drop the peer-count badge on the Network button.
- i18n: wrap 193 hardcoded literals with TR() (keys/translations added in
  the preceding i18n commit), so the security/PIN/lock flow, seed-backup
  wizard, and witness-rebuild dialog localize.

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

src/ui/windows/mining_stats.cpp

@@ -326,7 +326,7 @@ static void RenderLeftPoolCard(App* app, const WalletState& state, ImDrawList* d
                                 ? it->second.feePercent
                                 : kp.feePercent;
             if (feePct >= 0.0)
-                snprintf(right, sizeof(right), "%s  %s%% fee", hrStr.c_str(),
+                snprintf(right, sizeof(right), TR("grpc_hashrate_fee"), hrStr.c_str(),
                          FormatFeePercent(feePct).c_str());
             else
                 snprintf(right, sizeof(right), "%s", hrStr.c_str());
@@ -421,9 +421,10 @@ void RenderMiningStats(const WalletState& state, const MiningInfo& mining,
             // centered ~1000dp band inside the panel's padded content region; the
             // glass panel itself still fills rightW, leftover -> side margin.
             const float rightContentW = rightW - pad * 2.0f;
-            const float chartBandW    = std::min(rightContentW, 1000.0f * dp);
-            const float chartBandX    = rightMin.x + pad
-                                        + std::max(0.0f, (rightContentW - chartBandW) * 0.5f);
+            // Fill the panel's content width so the chart extends across the whole panel on a wide window.
+            // (Previously capped at ~1000dp and centered, which left large empty margins either side.)
+            const float chartBandW    = rightContentW;
+            const float chartBandX    = rightMin.x + pad;
 
             // Right panel: live log (if toggled + available) else the sparkline.
             if (showLogView) {