tui,dashboard: simplify Stats to single Total tokens row

v0.21.8 was about to ship with a three-row Stats section (New work,
Reprocessed, Total input). User feedback before release: the three-way
split needs more user-facing explanation than the value it delivers and
would generate support questions.

Hide New work and Reprocessed rows for now. Rename Total input ->
Total tokens. Keep the underlying snapshot fields (newWorkTokens,
totalInputTokens) and session_meta columns populated by the runtime
so a later release can re-introduce the categorization once we have a
cleaner UX for it.

UI-only change. No runtime, schema, or RPC contract changes.

- packages/plugin/src/tui/slots/sidebar-content.tsx: collapse three
  StatRows into one Total tokens row; guard switched from
  newWorkTokens != null to totalInputTokens != null
- packages/dashboard/src/components/SessionViewer/SessionViewer.tsx:
  collapse three Meta-tab rows into one Total tokens row

Author: ualtinok

packages/dashboard/src/components/SessionViewer/SessionViewer.tsx

@@ -1642,16 +1642,14 @@ export default function SessionViewer() {
                       <td>Input tokens</td>
                       <td>{metaData().last_input_tokens.toLocaleString()}</td>
                     </tr>
+                    {/* v0.21.8 ships a single "Total tokens" row while we
+                        figure out how to present new-work / reprocessed
+                        without confusing users. The underlying columns
+                        (new_work_tokens, total_input_tokens) are still
+                        populated by the runtime; only the UI is simplified
+                        for now. */}
                     <tr>
-                      <td>New work</td>
-                      <td>{metaData().new_work_tokens.toLocaleString()}</td>
-                    </tr>
-                    <tr>
-                      <td>Reprocessed</td>
-                      <td>{Math.max(0, metaData().total_input_tokens - metaData().new_work_tokens).toLocaleString()}</td>
-                    </tr>
-                    <tr>
-                      <td>Total input</td>
+                      <td>Total tokens</td>
                       <td>{metaData().total_input_tokens.toLocaleString()}</td>
                     </tr>
                     <tr>

packages/plugin/src/tui/slots/sidebar-content.tsx

@@ -442,27 +442,18 @@ const SidebarContent = (props: {
                 </>
             )}
 
-            {/* Stats */}
-            {s()?.newWorkTokens != null && (
+            {/* Stats — v0.21.8 ships a single "Total tokens" number while we
+                figure out how to present the new-work / reprocessed
+                categorization without confusing users. The underlying
+                snapshot fields (newWorkTokens, totalInputTokens) and the
+                session_meta columns are still populated; only the UI is
+                simplified for now. */}
+            {s()?.totalInputTokens != null && (
                 <>
                     <SectionHeader theme={props.theme} title="Stats" />
                     <StatRow
                         theme={props.theme}
-                        label="New work"
-                        value={compactTokens(s()!.newWorkTokens!)}
-                        dim
-                    />
-                    <StatRow
-                        theme={props.theme}
-                        label="Reprocessed"
-                        value={compactTokens(
-                            Math.max(0, (s()!.totalInputTokens ?? 0) - (s()!.newWorkTokens ?? 0)),
-                        )}
-                        dim
-                    />
-                    <StatRow
-                        theme={props.theme}
-                        label="Total input"
+                        label="Total tokens"
                         value={compactTokens(s()!.totalInputTokens ?? 0)}
                         dim
                     />