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/transactions_tab.cpp

@@ -263,10 +263,10 @@ void RenderTransactionsTab(App* app)
             int idx_map[] = {-1, 1, 0, 2};
             int idx = idx_map[type_filter];
             float xOff = idx * (cardW + cardGap);
-            ImVec2 acMin(origin.x + xOff, origin.y + cardH - 3);
+            ImVec2 acMin(origin.x + xOff, origin.y + cardH - 3 * vs);
             ImVec2 acMax(origin.x + xOff + cardW, origin.y + cardH);
             ImU32 acCol = (type_filter == 1) ? redCol : (type_filter == 2) ? greenCol : goldCol;
-            dl->AddRectFilled(acMin, acMax, acCol, 2.0f);
+            dl->AddRectFilled(acMin, acMax, acCol, 2.0f * hs);
         }
 
         ImGui::Dummy(ImVec2(availWidth, cardH));