feat(ui): settings polish — button retune, daemon card, RPC 2-row, chat preview

Settings tabs brought closer to the approved mockup:
- ActionButton/renderCardButton retune (settings-scoped): 7px radius, 9px
  padX, Primary → accent-outline chip, Secondary/card buttons more defined.
- Daemon-binary card: compact status right-aligned on the DAEMON BINARY
  heading (Up to date / Version differs / Not installed), filled/rounded
  status box, neutral danger divider (was alarming red), roomier spacing.
- RPC Connection: two-row column-aligned layout (Host | Port, then
  Username | Password) so the password no longer clips off the card edge.
- Chat settings tab: live conversation preview below the Appearance /
  Messaging cards; "Focus input on open" checkbox reflowed onto the console
  color-toggle row.
- Debug Options: "Current theme only" toggle restricts either screenshot
  sweep to the active theme instead of cycling every skin.
- Tabs fill the full content width (content-max-width cap disabled) and the
  sidebar nav panel centers within the true visible area.
- i18n: new keys for the above (untranslated keys fall back to English).

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

src/ui/material/settings_controls.h

@@ -107,7 +107,7 @@ inline float ActionButtonWidth(const char* label, const char* icon, float minWid
     ImFont* lf  = Type().button();
     ImFont* icf = Type().iconSmall();
     const float dp = Layout::dpiScale();
-    const float padX = 12.0f * dp, gap = 6.0f * dp;
+    const float padX = 9.0f * dp, gap = 6.0f * dp;   // mockup .btn padding: 9px horizontal
     const float labelW = lf->CalcTextSizeA(lf->LegacySize, FLT_MAX, 0, label).x;
     const float iconW  = (icon && icon[0] && icf) ? icf->CalcTextSizeA(icf->LegacySize, FLT_MAX, 0, icon).x : 0.0f;
     const float w = padX * 2.0f + iconW + (iconW > 0.0f ? gap : 0.0f) + labelW;
@@ -133,19 +133,21 @@ inline bool ActionButton(const char* id, const char* label, const char* icon, Ac
     if (hov) ImGui::SetMouseCursor(ImGuiMouseCursor_Hand);
     ImDrawList* dl = ImGui::GetWindowDrawList();
     const ImVec2 pMax(pos.x + w, pos.y + h);
-    const float round = ImGui::GetStyle().FrameRounding;
+    const float round = 7.0f * dp;   // mockup .btn radius: 7px (softer than the global 4px frame)
     const float a = ImGui::GetStyle().Alpha;   // BeginDisabled() lowers this
 
     ImU32 bg = 0, border = 0, fg = OnSurface();
     bool glass = false;
     switch (tier) {
         case ActionTier::Primary:
-            bg = WithAlpha(Primary(), act ? 255 : (hov ? 245 : 220));
-            fg = IM_COL32(255, 255, 255, 240);
+            // Mockup .btn.acc: a dark accent-tinted chip with accent TEXT — not a bright filled button.
+            bg     = WithAlpha(Primary(), hov ? 52 : 38);
+            border = WithAlpha(Primary(), hov ? 150 : 110);
+            fg     = Primary();
             break;
         case ActionTier::Secondary:
-            bg = WithAlpha(OnSurface(), hov ? 26 : 16);
-            border = WithAlpha(OnSurface(), 40);
+            bg = WithAlpha(OnSurface(), hov ? 30 : 20);
+            border = WithAlpha(OnSurface(), 48);
             glass = true;
             fg = OnSurface();
             break;