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/balance_components.cpp

@@ -264,7 +264,7 @@ void RenderSharedAddressList(App* app, float listH, float availW,
     } else if (rows.empty()) {
         float cw = ImGui::GetContentRegionAvail().x;
         float ch = ImGui::GetContentRegionAvail().y;
-        if (ch < 60) ch = 60;
+        if (ch < 60.0f * dp) ch = 60.0f * dp;
         const char* emptyMsg = addr_search[0] ? TR("no_addresses_match") : TR("no_addresses_yet");
         ImVec2 msgSz = ImGui::CalcTextSize(emptyMsg);
         ImGui::SetCursorPosX((cw - msgSz.x) * 0.5f);