feat(tui): card windowing, log G-jump, header tiny mode, expand-log width

- BoardView columns now window their card list against the available
  rows so the cursor stays visible. Cards beyond the viewport scroll
  in via "↑ N more" / "↓ N more" indicators. Fixes the "can't reach
  cards in the Done column" bug — selectedIndex was advancing but the
  cards were clipped.
- Logs section: G (vim-style, in addition to End) jumps to newest
  entry. Lowercase g stays as the global Settings shortcut.
- MainHeader gains two new collapse tiers: cols < 50 renders just
  FUSION + the active tab pills (no inactive tabs, no dividers); rows
  < 10 hides the header entirely so the row isn't wasted.
- ExpandedLog stretches to width="100%" so the panel keeps its width
  when an entry is expanded — was collapsing to content width before.
- Lighter blue palette throughout (cyanBright / cyan); status-mode
  grid widened to 5:6 so Stats panel gets ~45% of cols.
- Stats: heap limit always on its own continuation row; bytes
  formatted with a space ("450 MB") so a forced wrap, if it ever
  happens, breaks after the unit.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/agents.md

@@ -90,9 +90,26 @@ The agents surface provides:
 - A compact **Controls** popup for secondary actions (state filter, Show system agents toggle, Import, and global Heartbeat Speed)
 - Detail/config panels
 - Runtime metrics and active-agent live cards rendered below the main collection
+- A per-agent **Token Usage** panel that summarizes cumulative token consumption for the currently displayed agents
 - Run history
 - Task assignment context
 
+### Token Usage Panel
+
+The **Token Usage** panel in Agents view is derived from each agent's persisted cumulative counters:
+
+- `totalInputTokens`
+- `totalOutputTokens`
+
+For the current filtered/visible agent set, the panel shows:
+
+- Aggregate input token total
+- Aggregate output token total
+- Aggregate combined total (`input + output`)
+- Per-agent rows sorted by descending combined token usage
+
+If either token field is missing for an agent, the dashboard treats it as `0` so the panel stays stable and never crashes on partial/migrating data.
+
 ### Agent Deletion Controls
 
 Agent deletion is available from both the detail header lifecycle controls and the **Settings** tab's danger zone.