Refactor Journal Entry view: Extract Header and clean up Editor bindings

src/routes/journals/JournalEntry_Editor.svelte

@@ -42,7 +42,7 @@
                 readonly={true}
                 content={tmp_entry_obj?.content ?? ''}
                 bind:new_content={tmp_entry_obj.content}
-                bind:theme_mode={$ae_loc.theme_mode}
+                theme_mode={$ae_loc.theme_mode}
                 placeholder="No content..."
                 class="p-2 preset-outlined-success-400-600 shadow-lg rounded-lg w-full max-w-6xl"
             />
@@ -87,7 +87,7 @@
                     content={tmp_entry_obj?.content ?? ''}
                     bind:new_content={tmp_entry_obj.content}
                     bind:editorView
-                    bind:theme_mode={$ae_loc.theme_mode}
+                    theme_mode={$ae_loc.theme_mode}
                     placeholder="Write using Markdown..."
                     class="p-2 preset-outlined-warning-300-700 shadow-lg rounded-lg w-full max-w-6xl bg-surface-50 dark:bg-surface-800"
                 />