refactor: extract inline HTML to templates, split oversized files, fix bugs

- Extract all inline HTML from JS into 21 Handlebars templates (chat/, dialogs/, ui/)
- Split utils.mjs (1507) into barrel + helpers.mjs, combat.mjs, d30.mjs
- Split roll.mjs (1632) into barrel + roll-base.mjs, roll-prompt.mjs, roll-combat.mjs, roll-damage.mjs
- Split lethal-fantasy.mjs (1426) into bootstrap + chat-reaction.mjs
- Fix: missing async on injectDiceTray (free-roll.mjs:29 SyntaxError)
- Fix: weapon._id fallback for deserialized chat-message weapon objects
- Fix: missing await on rollModifier.evaluate() calls in roll-combat.mjs
- Fix: choices→choicesList ReferenceError in utils.mjs
- Fix: add 12 missing i18n keys (chooseWeapon, chooseSave, attackRoll, etc.)
- Fix: restore sideLabel in bonus-die-select.hbs
- Clean: remove dead messageContent param, console.log→log()
- Style: barrel files preserve existing import paths

module/applications/combat.mjs

@@ -208,9 +208,10 @@ export class LethalFantasyCombat extends Combat {
       c => c.actor?.type === "monster" && !c.isDefeated && c.initiative !== null && this.round >= c.initiative
     );
     if (eligibleMonsters.length > 0 && this._monsterProgressionRolledRound !== this.round) {
+      const content = await foundry.applications.handlebars.renderTemplate("systems/fvtt-lethal-fantasy/templates/dialogs/combat-monsters-not-rolled.hbs", {message: game.i18n.localize("LETHALFANTASY.Combat.monstersNotRolledMsg")})
       const proceed = await foundry.applications.api.DialogV2.confirm({
         window: { title: game.i18n.localize("LETHALFANTASY.Combat.monstersNotRolledTitle") },
-        content: `<p>${game.i18n.localize("LETHALFANTASY.Combat.monstersNotRolledMsg")}</p>`,
+        content,
         yes: { label: game.i18n.localize("LETHALFANTASY.Combat.proceedYes") },
         no: { label: game.i18n.localize("LETHALFANTASY.Combat.proceedNo") },
         rejectClose: false,