✨ New Features & 🐛 Bug Fixes

✨New

🏷 Per-entity tooltip name

You can now override the name shown in the hover tooltip independently from the state row's name. Useful when you want a longer, more descriptive name on the state row (where there's room) and a short label — or no label at all — in the tooltip.

entities:
  # State row reads "Roof PV solar production"; tooltip just says "Solar"
  - entity: sensor.solar_power
    name: "Roof PV solar production"
    tooltip_name: "Solar"

  # State row shows the full name; tooltip omits the name entirely,
  # leaving just the color swatch and value
  - entity: sensor.solar_power
    name: "Roof PV solar production"
    tooltip_name: ""

  # No tooltip_name set → tooltip inherits Custom Name → friendly_name
  # → entity id, same as before
  - entity: sensor.solar_power

Setting tooltip_name: "" explicitly is the way to opt into the "no name" look — leaving the field out keeps the existing inheritance chain intact.

Editor: General tab → new Tooltip Name field next to Custom Name.

🔢 Y-axis number format

Card-level option to control how numeric labels on the Y axis are formatted. Mirrors the per-entity number_format option but applies specifically to axis ticks, which previously always rendered with a dot decimal and no thousands separator regardless of locale.

y_axis_number_format: system  # follow HA locale (default)
# y_axis_number_format: comma  # 1.234,56
# y_axis_number_format: dot    # 1,234.56

This is independent from per-entity number_format, which keeps driving state row, tooltip and data label formatting. Pick the one that matches the audience of the dashboard — system is the right default for almost everyone since it follows the user's HA locale automatically.

Editor: Y Axis → Labels section → new Y Axis Format dropdown next to
Y Axis Ticks and Y Axis Decimals.

---

🐛 Bug Fixes

• Tooltip vertical line was missing after v3.03
• diff aggregate now works on History only entities (#182 follow-up)