Merge remote-tracking branch 'upstream/master' into wiring-manager

Conflicts resolved in 24 files. Notable decisions:

- ico/icon-themes.qrc: upstream's icon folder restructure kept; the 36
  cable icon entries re-added under the new qet/qet-dark path scheme
  (XML valid, every referenced file exists).
- Toolbar system: upstream's DiagramToolbarSettings now owns the
  toolbar filling. The cable tool is registered as
  diagrameditor.add_cable (generic group loop) and listed on the
  "diagram" toolbar right after the auto-break conductor action,
  separated by a divider, exactly like before the merge.
- Paste: the cable lines of a copy are handed to
  PasteNumberingImport::push() as extra commands, so paste + cable
  lines + the numbering question stay ONE undo step on both paste
  paths (DiagramView::paste and DiagramEventAddPaste::commit).
- PDF links: upstream's deterministic link sorting kept together with
  the cable cross-reference injector (injectLinkTo -> links list).
- Element renumbering: upstream's ElementAutoNumSchemeCommand::renumber
  replaces the old formula-based body of
  QETProject::renumberElementsBySchemeTitle; the cable numbering rule
  API (cableAutoNum, axis priority, rule name) is kept in full.
- Auto-numbering pages: upstream's scheme management kept, the Câbles
  tab added as index 4 (changeToCableTab), both entry points
  changeToCable() and changeToElement() kept side by side.
- SelectAutonumW: dirty tracking and the contextEdited signal moved
  into upstream's insertPartRow() row API, so single-rule mode, the
  rule-removable button and "confirm without change leaves the project
  alone" keep working.
- xrefpropertieswidget: upstream's offset clamping kept; the cable
  branch (Texte field, Police button, hidden display options) kept;
  the stack-overlapping checkbox is hidden for cables.

Verified after the merge: build green (515/515, no errors), ctest
85/86 (only the pre-existing headless tst_menubarkeyboard failure),
offscreen smoke exit 124.

ico/128x128/terminalstrip.svg

@@ -1,48 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128" width="128" height="128">
-  <!-- DIN rail -->
-  <rect x="6" y="86" width="116" height="18" rx="3" fill="#7f8c8d"/>
-  <rect x="6" y="92" width="116" height="6" fill="#4d4d4d"/>
-  <!-- six terminal blocks: L, L, N, PE, L, spare -->
-  <g fill="#eff0f1">
-    <rect x="12" y="26" width="16" height="66" rx="2"/>
-    <rect x="30" y="26" width="16" height="66" rx="2"/>
-    <rect x="48" y="26" width="16" height="66" rx="2"/>
-    <rect x="66" y="26" width="16" height="66" rx="2"/>
-    <rect x="84" y="26" width="16" height="66" rx="2"/>
-    <rect x="102" y="26" width="16" height="66" rx="2"/>
-  </g>
-  <!-- right-hand shading of each block -->
-  <g fill="#bdc3c7">
-    <rect x="24" y="28" width="4" height="62"/>
-    <rect x="42" y="28" width="4" height="62"/>
-    <rect x="60" y="28" width="4" height="62"/>
-    <rect x="78" y="28" width="4" height="62"/>
-    <rect x="96" y="28" width="4" height="62"/>
-    <rect x="114" y="28" width="4" height="62"/>
-  </g>
-  <!-- colored marker bands -->
-  <rect x="12" y="26" width="16" height="10" rx="2" fill="#7f8c8d"/>
-  <rect x="30" y="26" width="16" height="10" rx="2" fill="#7f8c8d"/>
-  <rect x="48" y="26" width="16" height="10" rx="2" fill="#3daee9"/>
-  <rect x="66" y="26" width="16" height="10" rx="2" fill="#27ae60"/>
-  <rect x="70" y="26" width="8" height="10" fill="#fdbc4b"/>
-  <rect x="84" y="26" width="16" height="10" rx="2" fill="#7f8c8d"/>
-  <rect x="102" y="26" width="16" height="10" rx="2" fill="#da4453"/>
-  <!-- screws -->
-  <g fill="#31363b">
-    <circle cx="20" cy="50" r="4.5"/><circle cx="20" cy="74" r="4.5"/>
-    <circle cx="38" cy="50" r="4.5"/><circle cx="38" cy="74" r="4.5"/>
-    <circle cx="56" cy="50" r="4.5"/><circle cx="56" cy="74" r="4.5"/>
-    <circle cx="74" cy="50" r="4.5"/><circle cx="74" cy="74" r="4.5"/>
-    <circle cx="92" cy="50" r="4.5"/><circle cx="92" cy="74" r="4.5"/>
-    <circle cx="110" cy="50" r="4.5"/><circle cx="110" cy="74" r="4.5"/>
-  </g>
-  <g fill="#eff0f1">
-    <rect x="16" y="49" width="8" height="2"/><rect x="16" y="73" width="8" height="2"/>
-    <rect x="34" y="49" width="8" height="2"/><rect x="34" y="73" width="8" height="2"/>
-    <rect x="52" y="49" width="8" height="2"/><rect x="52" y="73" width="8" height="2"/>
-    <rect x="70" y="49" width="8" height="2"/><rect x="70" y="73" width="8" height="2"/>
-    <rect x="88" y="49" width="8" height="2"/><rect x="88" y="73" width="8" height="2"/>
-    <rect x="106" y="49" width="8" height="2"/><rect x="106" y="73" width="8" height="2"/>
-  </g>
-</svg>

ico/16x16/window-close.svg

@@ -1,17 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
-  <defs id="defs3051">
-    <style type="text/css" id="current-color-scheme">
-      .ColorScheme-Text {
-        color:#4d4d4d;
-      }
-      .ColorScheme-NegativeText {
-        color:#da4453;
-      }
-      </style>
-  </defs>
-  <path
-     style="fill:currentColor;fill-opacity:1;stroke:none" 
-     class="ColorScheme-NegativeText"
-    d="M 8,2 A 6,6 0 0 0 2,8 6,6 0 0 0 8,14 6,6 0 0 0 14,8 6,6 0 0 0 8,2 Z M 5.70703,5 8,7.29297 10.29297,5 11,5.70703 8.70703,8 11,10.29297 10.29297,11 8,8.70703 5.70703,11 5,10.29297 7.29297,8 5,5.70703 5.70703,5 Z"
-        />
-</svg>