add help docs and ?

docs/nodes/Value Display.md

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+# Value Display
+
+Display a FLOAT value, or a selected numeric row from a measurement table, and pass the value through unchanged.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| value | FLOAT or RECORD_TABLE | No | Numeric value or measurement table to display; overrides the text input when connected |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| value | FLOAT | The numeric value (from socket or parsed from text) |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| number_input | STRING (text input) | "0" | Manual numeric entry, e.g. "1.5 nm"; hidden when value socket is connected |
+| measurement | STRING (dropdown) | "" | Row selector when a RECORD_TABLE is connected; visible only for RECORD_TABLE inputs |
+
+## Limitations
+
+- When a RECORD_TABLE is connected, only rows with numeric values can be selected; non-numeric rows are not accessible.
+- Manual text entry supports optional SI unit suffix (e.g. "1.5 nm") for display only; the output FLOAT is always the raw numeric value.