Allow picking of spell level through context menu

[haste]

Some different version of spell scaling text:

2014

// Fireall
<p><em><strong>At Higher Levels.</strong></em> When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.</p>
// Bigby's Hand
<p><em><strong>At Higher Levels.</strong></em> When you cast this spell using a spell slot of 6th level or higher, the damage from the clenched fist option increases by 2d8 and the damage from the grasping hand increases by 2d6 for each slot level above 5th.</p>
// Chromatic Orb
<p><strong>At Higher Levels.</strong>&nbsp;When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.</p>
// Flame Strike
<p><strong>At Higher Levels.</strong> When you cast this spell using a spell slot of 6th level or higher, the fire damage or the radiant damage (your choice) increases by 1d6 for each slot level above 5th.</p>

2024

// Fireball
<p><strong><em>Using a Higher-Level Spell Slot.</em></strong> The damage increases by 1d6 for each spell slot level above 3.</p>
// Bigby's Hand
<p><strong><em>Using a Higher-Level Spell Slot.</em></strong> The damage of the Clenched Fist increases by 2d8 and the damage of the Grasping Hand increases by 2d6 for each spell slot level above 5.</p>
// Blinding Smite
<p><strong><em>Using a Higher-Level Spell Slot.</em></strong> The extra damage increases by 1d8 for each spell slot level above 3.</p>
// Chromatic Orb
<p><strong><em>Using a Higher-Level Spell Slot.</em></strong> The damage increases by 1d8 for each spell slot level above 1. The orb can leap a maximum number of times equal to the level of the slot expended, and a creature can be targeted only once by each casting of this spell.</p>
// Conjure Celestial
<p><strong><em>Using a Higher-Level Spell Slot.</em></strong> The healing and damage increase by 1d12 for each spell slot level above 7.</p>
// Flame Strike
<p><strong><em>Using a Higher-Level Spell Slot.</em></strong> The Fire damage and the Radiant damage increase by 1d6 for each spell slot level above 5.</p>