zwave-js / zwave-js-ui / 26153656584

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feat(ui): add Last Awake column for battery-powered nodes (#4643)

`lastActive` updates on any packet received from a node — including data
sent while asleep. Battery devices need a separate timestamp tracking
when the node actually transitioned to **Awake** (i.e., when it can
receive commands from the controller).

## Changes

### Backend (`api/lib/ZwaveClient.ts`)
- Added `lastAwake?: number` to `ZUINode`
- `_onNodeWakeUp` now sets `node.lastAwake = Date.now()` and emits a
partial socket update so connected clients receive the value immediately

### Frontend (`src/components/nodes-table/nodes-table.js`)
- Added `lastAwake` column (`type: 'date'`, label `"Last Awake"`) to the
nodes table — available in the column selector alongside `lastActive`;
mains-powered nodes simply show nothing

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: robertsLando <11502495+robertsLando@users.noreply.github.com>

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