feat: flat spell frontmatter, full source-book titles, drop circle

Parser reads human-friendly flat keys (range, targets, castingTime, overcast
list, threshold/successes, ...) and expands them to SpellData; fixes
[object Object] range, empty targets/casting time and blank overcast rows.
SOURCE_BOOKS ids now match vault slugs and show full book titles.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

templates/chat/spell-cast.hbs

@@ -4,7 +4,6 @@
         <div class="hbm-card-meta">
             {{#if mode}}<span class="badge mode mode-{{mode}}">{{localize (concat 'HBM.spell.castingMode.' mode)}}</span>{{/if}}
             {{#if school}}<span class="badge school">{{localize (concat 'HBM.spellSchool.' school)}}</span>{{/if}}
-            {{#if circle}}<span class="badge circle">{{localize 'HBM.spell.circle'}} {{circle}}</span>{{/if}}
             {{#if (or (eq mode "sacred") (eq mode "prayer"))}}
                 <span class="badge warning">{{localize 'HBM.spellCast.cannotBeUnraveled'}}</span>
             {{/if}}