journal: multi-select emotions and per-category writing templates

- Mood switches from a single enum column to a many-to-many
  JournalEntryMood table so an entry can carry several feelings at
  once; the vocabulary is trimmed to 9 named emotions (dropped the
  overlapping satisfaction scale) with unified noun-style labels.
- Categories can define a content_template that pre-fills the "new
  entry" textarea when selected (only if the user hasn't started
  typing), seeded with a Story/Feelings/Decisions/Insights/Actions
  reflection template on the default "일상" category.
- Fixes a real attribute-injection bug found while building the
  template feature: Jinja's built-in |tojson filter doesn't escape
  double quotes, which breaks a double-quoted x-data="..." attribute
  when the JSON payload contains one; added |forceescape and a
  regression test.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/templates/journal.html

@@ -59,6 +59,10 @@
           <label for="edit-category-color-{{ category.id }}">색상</label>
           <input type="color" id="edit-category-color-{{ category.id }}" name="color" value="{{ category.color or '#d97757' }}" />
         </div>
+        <div class="field">
+          <label for="edit-category-template-{{ category.id }}">기본 작성 틀 (선택)</label>
+          <textarea id="edit-category-template-{{ category.id }}" name="content_template" rows="4" placeholder="이 카테고리로 새 기록을 쓸 때 내용칸에 미리 채워줄 틀을 입력하세요">{{ category.content_template or '' }}</textarea>
+        </div>
         <div id="journal-category-edit-error-{{ category.id }}" class="form-error-text"></div>
         <div style="display:flex; gap:8px;">
           <button type="submit" class="btn btn-primary" style="flex:1;">저장</button>
@@ -85,6 +89,10 @@
       <label for="new-category-color">색상 (선택)</label>
       <input type="color" id="new-category-color" name="color" value="#d97757" />
     </div>
+    <div class="field">
+      <label for="new-category-template">기본 작성 틀 (선택)</label>
+      <textarea id="new-category-template" name="content_template" rows="4" placeholder="이 카테고리로 새 기록을 쓸 때 내용칸에 미리 채워줄 틀을 입력하세요"></textarea>
+    </div>
     <div id="journal-category-error" class="form-error-text"></div>
     <button type="submit" class="btn btn-primary btn-block">추가하기</button>
   </form>
@@ -113,6 +121,17 @@
     open: false,
     moods: [],
     toggleMood(v) { this.moods.includes(v) ? this.moods = this.moods.filter(m => m !== v) : this.moods.push(v) },
+    categoryTemplates: {{ category_templates|tojson|forceescape }},
+    content: '',
+    lastAutoFilled: '',
+    onCategoryChange(categoryId) {
+      const tmpl = this.categoryTemplates[categoryId] || '';
+      if (this.content === this.lastAutoFilled) {
+        this.content = tmpl;
+        this.lastAutoFilled = tmpl;
+      }
+    },
+    init() { this.onCategoryChange(this.$refs.categorySelect.value); },
   }"
 >
   <button type="button" class="btn btn-primary btn-block" @click="open = !open">
@@ -135,7 +154,7 @@
   >
     <div class="field">
       <label for="new-entry-category">카테고리</label>
-      <select id="new-entry-category" name="category_id">
+      <select id="new-entry-category" name="category_id" x-ref="categorySelect" @change="onCategoryChange($event.target.value)">
         {% for category in categories %}
         <option value="{{ category.id }}" {{ 'selected' if category_id == category.id }}>{{ category.name }}</option>
         {% endfor %}
@@ -154,7 +173,7 @@
 
     <div class="field">
       <label for="new-entry-content">내용</label>
-      <textarea id="new-entry-content" name="content" rows="5" required placeholder="오늘 하루는 어땠나요?"></textarea>
+      <textarea id="new-entry-content" name="content" rows="8" required placeholder="오늘 하루는 어땠나요?" x-model="content"></textarea>
     </div>
 
     <div class="field">