refactor(ui): extract shared ProgressBar / CopyableTextOverlay / DrawPill helpers

UI-standardization audit: three draw patterns were copy-pasted across tabs and
dialogs. Promote each to a material:: helper and adopt at every verbatim site.
Output is pixel-identical (same colors/geometry threaded through as params).

- material::DrawProgressBar / ProgressBar — replaces 3 byte-identical rounded
  fill bars in the daemon/xmrig/bootstrap download dialogs.
- material::CopyableTextOverlay — the click-to-copy affordance (hit button +
  hand cursor + tooltip + hover underline + clipboard) shared by the peers
  best-block hash and the 3 mining stats (difficulty/block/address). Returns
  "copied this frame" so callers keep their own toast (no ui-layer dependency).
- material::DrawPill / PillSize — rounded bg + optional border + inset text
  badge, shared by the explorer status pill, the market Z/T chip, and the
  network official/custom tag.

Divergent one-offs left in place (transactions status pills use schema rounding
around pre-positioned multi-line text; the mining filter-pill is a button bg).

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

src/ui/windows/market_tab.cpp

@@ -654,10 +654,9 @@ static void pfDrawAddressSection(App* app)
         bool isZ = (a.type == "shielded");
         const char* chip = isZ ? "Z" : "T";
         ImU32 chipCol = isZ ? Success() : Warning();
-        float chipW = capF->CalcTextSizeA(capF->LegacySize, FLT_MAX, 0, chip).x + 8.0f * dp;
-        ldl->AddRectFilled(ImVec2(rx, rcy - capF->LegacySize * 0.5f - 2.0f),
-                           ImVec2(rx + chipW, rcy + capF->LegacySize * 0.5f + 2.0f), WithAlpha(chipCol, 40), 4.0f * dp);
-        ldl->AddText(capF, capF->LegacySize, ImVec2(rx + 4.0f * dp, rcy - capF->LegacySize * 0.5f), chipCol, chip);
+        ImVec2 chipPos(rx, rcy - capF->LegacySize * 0.5f - 2.0f);
+        float chipW = material::DrawPill(ldl, chipPos, chip, capF, chipCol,
+                                         WithAlpha(chipCol, 40), 0, ImVec2(4.0f * dp, 2.0f), 4.0f * dp).x;
         rx += chipW + Layout::spacingSm();
         std::string aicon = app->getAddressIcon(a.address);
         if (!aicon.empty()) {