feat(analysis): fold non-highlighted lines in the LOG viewer

src/renderer/css/styles.css

@@ -1346,6 +1346,91 @@ body.ana-ruler-dragging .ana-ruler-view {
   border-radius: 5px;
 }
 
+/* Fold bar: a full-width separator that stands in for a run of collapsed
+   (non-highlighted) lines, or sits above/below an expanded run. Its height is
+   set inline to match the virtualized line height exactly. */
+.ana-foldrow {
+  display: flex;
+  align-items: center;
+  min-width: 100%;
+  cursor: pointer;
+  user-select: none;
+  -webkit-user-select: none;
+  background: color-mix(in srgb, var(--accent) 5%, transparent);
+  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--accent) 22%, transparent);
+}
+.ana-foldrow.foot {
+  box-shadow: inset 0 -1px 0 color-mix(in srgb, var(--accent) 22%, transparent);
+}
+.ana-foldrow:hover {
+  background: color-mix(in srgb, var(--accent) 11%, transparent);
+}
+.ana-fold-bar {
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  height: 1.35em;
+  margin-left: 14px;
+  padding: 0 8px;
+  border-radius: 5px;
+  background: color-mix(in srgb, var(--accent) 16%, transparent);
+  color: var(--accent);
+  font-size: 0.82em;
+  font-weight: 700;
+  line-height: 1;
+}
+.ana-fold-ic::before {
+  content: '+';
+  font-weight: 800;
+}
+.ana-foldrow.open .ana-fold-ic::before {
+  content: '\2212'; /* minus sign */
+}
+.ana-fold-n {
+  font-variant-numeric: tabular-nums;
+  opacity: 0.95;
+}
+.ana-fold-jump {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  margin-left: 8px;
+  padding: 1px 4px;
+  border: none;
+  border-radius: 4px;
+  background: transparent;
+  color: var(--accent);
+  cursor: pointer;
+}
+.ana-fold-jump:hover {
+  background: color-mix(in srgb, var(--accent) 20%, transparent);
+}
+
+/* Toolbar fold toggle active state (mirrors the other ghost toggles). */
+#btnAnaFold.on {
+  color: var(--accent);
+  background: color-mix(in srgb, var(--accent) 14%, transparent);
+}
+
+/* Pulse a just-expanded run's background once, slowly, to point it out. */
+@keyframes anaFoldFlash {
+  0% {
+    background: transparent;
+  }
+  50% {
+    background: color-mix(in srgb, var(--accent) 34%, transparent);
+  }
+  100% {
+    background: transparent;
+  }
+}
+.ana-line.foldflash {
+  animation: anaFoldFlash 1.2s ease-in-out;
+}
+.ana-foldrow.foldflash {
+  animation: anaFoldFlash 1.2s ease-in-out;
+}
+
 .hl-error {
   color: #ff6b81;
   font-weight: 700;

src/renderer/i18n/en.json

@@ -74,6 +74,11 @@
   "ana.highlight": "Highlight",
   "ana.hl.auto": "Auto",
   "ana.hl.none": "Off",
+  "ana.fold": "Fold",
+  "ana.fold.title": "Fold lines without highlights, showing only highlighted lines",
+  "ana.fold.lines": "{n} hidden lines — click to expand",
+  "ana.fold.toBottom": "Jump to the bottom of this section",
+  "ana.fold.toTop": "Jump to the top of this section",
   "ana.copy": "Copy",
   "ana.zoomIn.title": "Zoom in (Ctrl +)",
   "ana.zoomOut.title": "Zoom out (Ctrl -)",

src/renderer/i18n/zh.json

@@ -72,6 +72,11 @@
   "ana.tab.copied": "已複製路徑",
   "ana.tab.copyFail": "複製失敗",
   "ana.highlight": "標記",
+  "ana.fold": "收折",
+  "ana.fold.title": "收折未標記的內容，只顯示被標記的行",
+  "ana.fold.lines": "已收折 {n} 行，點擊展開",
+  "ana.fold.toBottom": "跳到此段最下練",
+  "ana.fold.toTop": "跳到此段最上練",
   "ana.hl.auto": "自動",
   "ana.hl.none": "關閉",
   "ana.copy": "複製",

src/renderer/index.html

@@ -262,6 +262,10 @@ <h2 id="anaViewName" data-i18n="ana.viewer">檢視</h2>
                   <label class="ana-hl-label" for="anaHlSelect" data-i18n="ana.highlight">標記</label>
                   <select id="anaHlSelect" class="ana-hl-select"></select>
                 </div>
+                <button class="btn btn-ghost btn-sm ana-foldtoggle" id="btnAnaFold" type="button" data-i18n-title="ana.fold.title" title="收折未標記的內容，只顯示被標記的行">
+                  <svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="4" y="4" width="16" height="16" rx="2"/><line x1="9" y1="12" x2="15" y2="12"/><line x1="12" y1="9" x2="12" y2="15"/></svg>
+                  <span data-i18n="ana.fold">收折</span>
+                </button>
                 <div class="ana-levels" id="anaLevels"></div>
                 <div class="ana-nav" id="anaNav">
                   <span class="ana-nav-count" id="anaNavCount">0</span>