Combat UI: Unit Info Panel

Overview

Replace the current exit-button-only CombatUI with a unit info panel that displays the selected unit's name and HP. The panel appears in the bottom-left corner when a unit is selected and hides when deselected.

Scene Structure

CombatUI (CanvasLayer) — script: scripts/combat_ui.gd
  └─ UnitPanel (PanelContainer) — anchored bottom-left, hidden by default
       └─ MarginContainer
            └─ VBoxContainer
                 ├─ NameLabel (Label) — displays unit name
                 └─ HPBar (ProgressBar) — displays current_hp / max_hp

The existing exit button and its VBoxContainer are removed entirely.
The CombatUI CanvasLayer is preserved; its theme reference to main_ui_theme.tres stays.

Layout

UnitPanel is anchored to the bottom-left of the viewport.
Margin of 8px from the left and bottom edges.
Panel width: ~200px (enough for name and HP bar).
Height: determined by contents.

Behavior

Unit Discovery

CombatUI finds units by looking for nodes in the "units" group. Units must be added to this group — this is done in unit.tscn (scene-level group assignment) or in unit.gd's _ready().

Signal Connection

On _ready(), CombatUI:

Calls get_tree().get_nodes_in_group("units") to find all current units.
Connects each unit's unit_selected_changed(unit: Unit, selected: bool) signal to a handler.

Selection Handling

When unit_selected_changed is received:

If selected == true: populate NameLabel with unit.current_info.name, set HPBar's max_value to unit.current_stats.max_hp and value to unit.current_stats.current_hp, show UnitPanel.
If selected == false: hide UnitPanel.

Edge Cases

If no units exist in the group at ready time, the panel simply stays hidden.
If a unit is removed from the scene (e.g., defeated), the signal disconnects naturally with the node. The panel hides if that unit was selected.

Files Changed

File	Change
`prefabs/combat_ui.tscn`	Remove exit button/VBoxContainer. Add UnitPanel with NameLabel and HPBar. Attach new script.
`scripts/combat_ui.gd`	New script: connects to unit signals, shows/hides panel, populates data.
`prefabs/unit.tscn`	Add the node to the `"units"` group.

Styling

Uses the existing main_ui_theme.tres applied at the CombatUI or UnitPanel level. No new theme resources needed.

Out of Scope

Full stat display (ATK, DEF, etc.) — future expansion.
Animations (fade/slide) — instant show/hide only.
Pause menu / exit button — separate future feature.
HP bar color theming — uses default ProgressBar style from theme.

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