Rename "Todo list offset" to "Due soon" and add due_soon sensor state

[Copilot]

The todo_offset_days config option is renamed to due_soon_days, and a new due_soon sensor state is introduced: a task enters this state when 0 < due_in <= due_soon_days (i.e. it is approaching its due date within the configured threshold). Todo list sync behavior is unchanged — the same threshold continues to drive when tasks appear in todo lists.

Config & Options

• CONF_TODO_OFFSET_DAYS → CONF_DUE_SOON_DAYS ("due_soon_days")
• CONF_TODO_OFFSET_OVERRIDE → CONF_DUE_SOON_OVERRIDE ("due_soon_override")
• Options form label updated to "Due soon (days)"

State Logic (sensor.py)

New state priority (highest → lowest): inactive > due > due_soon > done

if not effective_active:
    self._attr_native_value = CONST_INACTIVE
elif self.due_in == 0:
    self._attr_native_value = CONST_DUE
elif self.due_in <= effective_due_soon_days:
    self._attr_native_value = CONST_DUE_SOON
# else: CONST_DONE

Migration

• Version bumped 1.2 → 1.3
• New migration step renames todo_offset_days/todo_offset_override keys in stored entry options
• Entries at 1.1 chain through both 1.1→1.2 and 1.2→1.3 in a single async_migrate_entry call

Frontend

• Card and panel: due_soon renders in orange (#e67e22), between red (due) and green (done)
• Panel filter buttons include due_soon count alongside existing states

Translations

• EN/DE strings updated with due_soon state labels and renamed option descriptions

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