feat: right-click menus everywhere, workspace/session cost, long-term DB safety

Right-click menus: one portal shell (components/ContextMenu.tsx) for every
item with actions - sidebar/Recents/archived session rows (SessionMenu),
console tabs, pane headers, the Changes panel's files/tree/commits, the
workspace home, sessions outside a workspace (SessionRowMenu: Sessions
table, Dashboard, Activity, Workflow runs), prompt images, every Settings
list and every Claude Code/Codex config list (FileItemMenu). Buttons stay;
a delete keeps its button's confirm; the shell stops portal clicks from
reaching the card that opened it.

Status bar: Workspace $ and Session $ on the Workspace page, from
?lane= on GET /api/pricing/cost and the focused/replayed session's cost.

Database, no data dropped: synchronous=NORMAL, journal_size_limit 64 MB,
hourly PASSIVE checkpoint + PRAGMA optimize, idx_events_session_created
(replacing the redundant idx_events_session), watchdog reads
sessions.transcript_path, transcript parsed before the hook's write
transaction, GET /api/sessions/:id?events=0 for the web page (reloads only
on its own session, debounced), streamed export, transactional clear-data
and chunked cleanup, subagent import reads tool_use_ids once, runtime logs
rotated past 5 MB.

client/src/components/lanes/LaneCard.tsx

@@ -1,7 +1,7 @@
 /**
  * @file One lane's card: CI/PR facts, the "needs you"
  * banner sourced from Claude Code's Notification hook, and (for managed
- * lanes only) a ⋯ menu holding the rare `reset worktree` action behind
+ * lanes only) a ⋯ menu — also on a right-click — holding the rare `reset worktree` action behind
  * DestructiveLaneModal. A dead lane (its driving session went silent while
  * it should have been working) is called out loudly — that is the failure
  * this view exists to catch. Stage, kind, and the "auto: <stage>" chip are
@@ -23,6 +23,7 @@
 import { useEffect, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { DestructiveLaneModal } from "./DestructiveLaneModal";
+import { ContextMenu, MenuItem, menuPoint, type MenuPoint } from "../ContextMenu";
 import { api } from "../../lib/api";
 import { eventBus } from "../../lib/eventBus";
 import { keepIfSame } from "../../lib/keepIfSame";
@@ -271,6 +272,7 @@ export default function LaneCard({
   const { t } = useTranslation(["lanes"]);
   const [destructiveAction, setDestructiveAction] = useState<"reset" | null>(null);
   const [menuOpen, setMenuOpen] = useState(false);
+  const [menuAt, setMenuAt] = useState<MenuPoint | null>(null);
   const [runtimeBump, setRuntimeBump] = useState(0);
   const [bootLine, setBootLine] = useState<string | null>(null);
   const runtime = useLaneRuntime(lane.id, runtimeBump);
@@ -301,6 +303,8 @@ export default function LaneCard({
     <>
       <div
         data-testid={`lane-card-${lane.id}`}
+        // Right-click: the ⋯ menu's actions at the pointer (managed only).
+        onContextMenu={lane.kind === "managed" ? (e) => setMenuAt(menuPoint(e)) : undefined}
         // Every row below is conditional: a lane with nothing to report
         // renders no frame at all rather than an empty box.
         className="flex flex-col rounded-lg border border-border bg-surface-4 p-2.5 transition-colors hover:border-border-light empty:hidden"
@@ -462,6 +466,19 @@ export default function LaneCard({
         )}
       </div>
 
+      {menuAt && (
+        <ContextMenu x={menuAt.x} y={menuAt.y} onClose={() => setMenuAt(null)}>
+          <MenuItem
+            danger
+            onSelect={() => {
+              setMenuAt(null);
+              setDestructiveAction("reset");
+            }}
+          >
+            {t("action.reset")}
+          </MenuItem>
+        </ContextMenu>
+      )}
       {destructiveAction && (
         <DestructiveLaneModal
           lane={lane}