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.

server/index.js

@@ -347,6 +347,16 @@ function startBackgroundServices() {
     .then(() => require("./lib/ai-tools").refresh())
     .catch(() => {});
 
+  // Hourly DB upkeep: a non-blocking checkpoint (the WAL then shrinks to
+  // journal_size_limit) and PRAGMA optimize. Off with DASHBOARD_DB_MAINTAIN_MS=0.
+  {
+    const every = Number(process.env.DASHBOARD_DB_MAINTAIN_MS ?? 60 * 60 * 1000);
+    if (every > 0) {
+      const t = setInterval(() => require("./db").maintainDatabase(), every);
+      if (t.unref) t.unref();
+    }
+  }
+
   // Rates for models seen in token_usage with no pricing row of their own.
   require("./lib/pricing-sync").startPricingSync(require("./db").db);
   // The AI Tools catalog of the newest release, when it is newer than this build.