feat(history): add commit action context menu in HistoryPanel

The commit history UI now provides a compact actions menu per commit,
with positioning constrained to the history panel. The menu supports
keyboard dismissal via Escape and closes on outside clicks to keep the
interaction predictable.

- Replace per-commit action buttons with an ellipsis menu
- Add context menu state and panel-relative positioning logic
- Style the new history context menu and menu button

src/app.css

@@ -1639,6 +1639,7 @@
   .branch-actions .btn-sm { min-height: 24px; padding: 0 6px; font-size: 11px; }
 
   .branch-context-menu,
+  .history-context-menu,
   .explorer-context-menu {
     z-index: 120;
     display: grid;
@@ -1651,10 +1652,12 @@
     box-shadow: 0 18px 50px rgba(0,0,0,0.5);
   }
 
-  .branch-context-menu { position: absolute; }
+  .branch-context-menu,
+  .history-context-menu { position: absolute; }
   .explorer-context-menu { position: fixed; }
 
   .branch-context-menu button,
+  .history-context-menu button,
   .explorer-context-menu button {
     display: flex;
     align-items: center;
@@ -1673,13 +1676,15 @@
   }
 
   .branch-context-menu button:hover:not(:disabled),
+  .history-context-menu button:hover:not(:disabled),
   .explorer-context-menu button:hover:not(:disabled) {
     border-color: var(--color-border-subtle);
     background: rgba(255,255,255,0.06);
     color: var(--color-ink);
   }
 
-  .branch-context-menu .menu-separator {
+  .branch-context-menu .menu-separator,
+  .history-context-menu .menu-separator {
     height: 1px;
     margin: 4px 3px;
     background: var(--color-border-subtle);
@@ -1696,6 +1701,7 @@
   }
 
   .branch-context-menu button:disabled,
+  .history-context-menu button:disabled,
   .explorer-context-menu button:disabled {
     cursor: not-allowed;
     opacity: 0.48;
@@ -1817,6 +1823,7 @@
 
   /* --- Commit history --- */
 
+  .history-panel { position: relative; }
   .history-list { min-width: 0; padding: 6px; overflow: auto; }
 
   .commit-row { display: grid; min-width: 0; gap: 8px; padding: 10px; border: 1px solid var(--color-border-subtle); border-radius: 8px; background: var(--color-surface-raised); transition: border-color 120ms; }
@@ -2017,6 +2024,22 @@
   }
   .commit-action-buttons { display: flex; flex: 0 0 auto; align-items: center; gap: 5px; }
   .commit-action-buttons button { flex: 0 0 auto; white-space: nowrap; }
+  .commit-menu-button {
+    width: 28px;
+    min-width: 28px;
+    min-height: 26px;
+    padding: 0;
+    border-color: rgba(94,110,156,0.16);
+    border-radius: 7px;
+    background: rgba(255,255,255,0.035);
+    color: var(--color-ink-dim);
+  }
+  .commit-menu-button:hover:not(:disabled),
+  .commit-menu-button[aria-expanded="true"] {
+    border-color: rgba(65,209,255,0.28);
+    background: rgba(65,209,255,0.08);
+    color: var(--color-ink);
+  }
   .file-history-head { align-items: flex-start; }
   .file-history-heading { min-width: 0; flex: 1 1 auto; overflow: hidden; }
   .section-head .file-history-name {

src/lib/components/HistoryPanel.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { ChevronDown, ChevronRight, GitBranch, GitMerge, RotateCcw, X } from "@lucide/svelte";
+  import { ChevronDown, ChevronRight, EllipsisVertical, GitBranch, GitMerge, RotateCcw, X } from "@lucide/svelte";
   import type { FileStatusKind, GitCommit, GitCommitFile } from "../types";
 
   interface GraphSegment {
@@ -60,6 +60,10 @@
   let branchDialogOpen = $state(false);
   let userAdjustedBranchFilter = $state(false);
   let lastDefaultFilterKey = $state("");
+  let panelElement = $state<HTMLElement | null>(null);
+  let contextCommit = $state<GitCommit | null>(null);
+  let contextMenuX = $state(0);
+  let contextMenuY = $state(0);
 
   function laneColor(col: number): string {
     return GRAPH_COLORS[((col % GRAPH_COLORS.length) + GRAPH_COLORS.length) % GRAPH_COLORS.length];
@@ -316,6 +320,54 @@
     }
   }
 
+  function openCommitActionMenu(event: MouseEvent, commit: GitCommit) {
+    event.preventDefault();
+    event.stopPropagation();
+    if (isBusy) return;
+
+    if (contextCommit?.hash === commit.hash) {
+      closeCommitContextMenu();
+      return;
+    }
+
+    const panelRect = panelElement?.getBoundingClientRect();
+    const buttonRect = event.currentTarget instanceof HTMLElement
+      ? event.currentTarget.getBoundingClientRect()
+      : null;
+    const rawX = panelRect && buttonRect ? buttonRect.right - panelRect.left - 184 : event.offsetX;
+    const rawY = panelRect && buttonRect ? buttonRect.bottom - panelRect.top + 4 : event.offsetY;
+    const maxX = Math.max(8, (panelRect?.width ?? window.innerWidth) - 192);
+    const maxY = Math.max(8, (panelRect?.height ?? window.innerHeight) - 96);
+
+    contextCommit = commit;
+    contextMenuX = Math.max(8, Math.min(rawX, maxX));
+    contextMenuY = Math.max(8, Math.min(rawY, maxY));
+  }
+
+  function closeCommitContextMenu() {
+    contextCommit = null;
+  }
+
+  async function createBranchFromContextCommit() {
+    const commit = contextCommit;
+    if (!commit || isBusy) return;
+    closeCommitContextMenu();
+    await onCreateBranchFromCommit(commit);
+  }
+
+  async function restoreContextCommit() {
+    const commit = contextCommit;
+    if (!commit || isBusy) return;
+    closeCommitContextMenu();
+    await onRestoreCommit(commit);
+  }
+
+  function handleWindowKeydown(event: KeyboardEvent) {
+    if (event.key !== "Escape") return;
+    closeCommitContextMenu();
+    handleBranchDialogKeydown(event);
+  }
+
   function localBranchRefs(commit: GitCommit): string[] {
     const seen = new Set<string>();
     const labels: string[] = [];
@@ -393,9 +445,9 @@
   let graphWidth = $derived(Math.max(Math.max(graph.columns, 1) * GRAPH_LANE + 18, 42));
 </script>
 
-<svelte:window onkeydown={handleBranchDialogKeydown} />
+<svelte:window onclick={closeCommitContextMenu} onkeydown={handleWindowKeydown} on:contextmenu|capture={closeCommitContextMenu} />
 
-<section class="panel grid grid-rows-[auto_1fr] overflow-hidden" aria-label="Commit history">
+<section bind:this={panelElement} class="panel history-panel grid grid-rows-[auto_1fr] overflow-hidden" aria-label="Commit history">
   <div class="section-head">
     <div>
       <span class="eyebrow">History</span>
@@ -433,7 +485,12 @@
         {@const row = graphRows[rowIndex]}
         {@const hoverBranchRefs = visibleBranchLabels(row?.branchLabels ?? [])}
         {@const otherRefs = visibleRefs(item)}
-        <article class="commit-row graph-row" class:merge-row={item.parents.length > 1} class:root-row={item.parents.length === 0} class:tip-row={item.refs.length > 0}>
+        <article
+          class="commit-row graph-row"
+          class:merge-row={item.parents.length > 1}
+          class:root-row={item.parents.length === 0}
+          class:tip-row={item.refs.length > 0}
+        >
           <div class="graph-gutter" style={`width:${graphWidth}px`} aria-hidden="true">
             {#if row}
               <svg class="graph-svg" viewBox={`0 0 ${graphWidth} 100`} preserveAspectRatio="none">
@@ -545,13 +602,17 @@
             <div class="commit-actions">
               <time class="commit-time" datetime={item.date}>{formatCommitDate(item.date)}</time>
               <div class="commit-action-buttons">
-                <button class="btn-sm" type="button" onclick={() => onCreateBranchFromCommit(item)} disabled={isBusy} title="Create a new branch from this commit">
-                  <GitBranch size={15} aria-hidden="true" />
-                  Branch
-                </button>
-                <button class="btn-sm" type="button" onclick={() => onRestoreCommit(item)} disabled={isBusy} title="Bring this commit's files into your working tree as unstaged changes (no history is changed)">
-                  <RotateCcw size={15} aria-hidden="true" />
-                  Restore
+                <button
+                  class="commit-menu-button"
+                  type="button"
+                  onclick={(event) => openCommitActionMenu(event, item)}
+                  disabled={isBusy}
+                  title="Commit actions"
+                  aria-label={`Actions for ${item.short_hash}`}
+                  aria-haspopup="menu"
+                  aria-expanded={contextCommit?.hash === item.hash}
+                >
+                  <EllipsisVertical size={15} aria-hidden="true" />
                 </button>
               </div>
             </div>
@@ -560,6 +621,25 @@
       {/each}
     </div>
   {/if}
+
+  {#if contextCommit}
+    <div
+      class="history-context-menu"
+      style={`left: ${contextMenuX}px; top: ${contextMenuY}px;`}
+      role="menu"
+      tabindex="-1"
+      aria-label={`Actions for ${contextCommit.short_hash}`}
+    >
+      <button type="button" role="menuitem" onclick={createBranchFromContextCommit} disabled={isBusy}>
+        <GitBranch size={14} aria-hidden="true" />
+        Branch
+      </button>
+      <button type="button" role="menuitem" onclick={restoreContextCommit} disabled={isBusy}>
+        <RotateCcw size={14} aria-hidden="true" />
+        Restore
+      </button>
+    </div>
+  {/if}
 </section>
 
 {#if branchDialogOpen}