refactor(sort): introduce build_tmp_sort utility; apply to event_presentation and journals

Creates src/lib/ae_core/core__idb_sort.ts with build_tmp_sort() — a shared
helper for computing tmp_sort_1/2/3 fields stored in Dexie. Fixes two bugs
present in all generic _process_generic_props implementations:
  - priority encoded as 0/1 ASC (true sorted last); now inverted: true→'0'
  - sort stored as unpadded string ("10" < "2"); now 8-char zero-padded

Applied to:
  - ae_events__event_presentation: replaces inline specific_processor code
  - ae_journals__journal + ae_journals__journal_entry: replaces manual formulas;
    journal liveQueries (.reverse().sortBy()) updated to plain .sortBy() since
    the inverted encoding handles direction without needing Dexie's .reverse()

Other modules (sessions, presenters, locations, posts, core) left unchanged
until their sort behavior is reviewed separately.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/ae_core/core__idb_sort.ts

@@ -0,0 +1,54 @@
+/**
+ * src/lib/ae_core/core__idb_sort.ts
+ *
+ * Shared utility for computing tmp_sort_* fields stored in Dexie.
+ * All fields are designed for ascending .sortBy() — no .reverse() needed.
+ *
+ * Encoding rules:
+ *   priority — inverted boolean: true→'0', false→'1' so priority=true sorts first (ASC)
+ *   sort     — zero-padded integer string so "00000010" < "00000020" (correct numeric order)
+ *   all other fields — appended as-is; ISO 8601 datetimes already sort correctly
+ *
+ * Usage:
+ *   const { tmp_sort_1, tmp_sort_2, tmp_sort_3 } = build_tmp_sort({
+ *       prefix: [obj.group ?? '0'],      // fields before priority (optional)
+ *       priority: obj.priority,
+ *       sort: obj.sort,
+ *       fields_1: [obj.start_datetime],  // appended to base for tmp_sort_1
+ *       fields_2: [obj.name],            // appended after fields_1 for tmp_sort_2
+ *       fields_3: [obj.updated_on],      // appended after fields_2 for tmp_sort_3
+ *   });
+ */
+export function build_tmp_sort({
+    prefix = [],
+    priority,
+    sort,
+    fields_1 = [],
+    fields_2 = [],
+    fields_3 = [],
+    pad_width = 8
+}: {
+    prefix?: (string | null | undefined)[];
+    priority?: boolean | null;
+    sort?: number | string | null;
+    fields_1?: (string | null | undefined)[];
+    fields_2?: (string | null | undefined)[];
+    fields_3?: (string | null | undefined)[];
+    pad_width?: number;
+}): { tmp_sort_1: string; tmp_sort_2: string; tmp_sort_3: string } {
+    const clean = (v: string | null | undefined): string => v ?? '';
+
+    const p = priority ? '0' : '1';
+    const s = String(Number(sort ?? 0)).padStart(pad_width, '0');
+
+    const parts_base = [...prefix.map(clean), p, s].join('_');
+    const parts_1 = fields_1.map(clean).filter(Boolean).join('_');
+    const parts_2 = fields_2.map(clean).filter(Boolean).join('_');
+    const parts_3 = fields_3.map(clean).filter(Boolean).join('_');
+
+    const tmp_sort_1 = [parts_base, parts_1].filter(Boolean).join('_');
+    const tmp_sort_2 = [tmp_sort_1, parts_2].filter(Boolean).join('_');
+    const tmp_sort_3 = [tmp_sort_2, parts_3].filter(Boolean).join('_');
+
+    return { tmp_sort_1, tmp_sort_2, tmp_sort_3 };
+}

src/lib/ae_events/ae_events__event_presentation.ts

@@ -2,6 +2,7 @@ import type { key_val } from '$lib/stores/ae_stores';
 import { api } from '$lib/api/api';
 
 import { db_save_ae_obj_li__ae_obj } from '$lib/ae_core/core__idb_dexie';
+import { build_tmp_sort } from '$lib/ae_core/core__idb_sort';
 import { db_events } from '$lib/ae_events/db_events';
 import type { ae_EventPresentation } from '$lib/types/ae_types';
 
@@ -680,6 +681,17 @@ export async function process_ae_obj__event_presentation_props({
             if (obj.event_session_id_random)
                 obj.event_session_id = obj.event_session_id_random;
             if (obj.event_id_random) obj.event_id = obj.event_id_random;
+
+            // Override generic tmp_sort_* with presentation-specific encoding via
+            // build_tmp_sort. Order: priority DESC → sort ASC → start_datetime ASC → code ASC → name ASC
+            const { tmp_sort_1, tmp_sort_2 } = build_tmp_sort({
+                priority: obj.priority,
+                sort: obj.sort,
+                fields_1: [obj.start_datetime, obj.code],
+                fields_2: [obj.name]
+            });
+            obj.tmp_sort_1 = tmp_sort_1;
+            obj.tmp_sort_2 = tmp_sort_2;
             return obj;
         }
     });

src/lib/ae_journals/ae_journals__journal.ts

@@ -4,6 +4,7 @@ import type { key_val } from '$lib/stores/ae_stores';
 import { api } from '$lib/api/api';
 
 import { db_save_ae_obj_li__ae_obj } from '$lib/ae_core/core__idb_dexie';
+import { build_tmp_sort } from '$lib/ae_core/core__idb_sort';
 import { db_journals } from '$lib/ae_journals/db_journals';
 import type { ae_Journal } from '$lib/types/ae_types';
 
@@ -885,9 +886,16 @@ export async function process_ae_obj__journal_props({
 
             const updated =
                 obj.updated_on ?? obj.created_on ?? new Date(0).toISOString();
-            obj.tmp_sort_3 = `${obj.group ?? '0'}_${obj.priority ? 1 : 0}_${obj.sort ?? '0'}_${
-                obj.name
-            }_${updated}`;
+            const { tmp_sort_1, tmp_sort_2, tmp_sort_3 } = build_tmp_sort({
+                prefix: [obj.group ?? '0'],
+                priority: obj.priority,
+                sort: obj.sort,
+                fields_2: [obj.name],
+                fields_3: [updated]
+            });
+            obj.tmp_sort_1 = tmp_sort_1;
+            obj.tmp_sort_2 = tmp_sort_2;
+            obj.tmp_sort_3 = tmp_sort_3;
             obj.combined_passcode = `${obj.passcode ?? ''}:${obj.private_passcode ?? ''}`;
 
             return obj;

src/lib/ae_journals/ae_journals__journal_entry.ts

@@ -4,6 +4,7 @@ import type { key_val } from '$lib/stores/ae_stores';
 import { api } from '$lib/api/api';
 
 import { db_save_ae_obj_li__ae_obj } from '$lib/ae_core/core__idb_dexie';
+import { build_tmp_sort } from '$lib/ae_core/core__idb_sort';
 import { db_journals } from '$lib/ae_journals/db_journals';
 import type { ae_JournalEntry } from '$lib/types/ae_types';
 
@@ -1050,19 +1051,20 @@ export async function process_ae_obj__journal_entry_props({
             obj.history = history;
             obj.history_md_html = history_md_html;
 
-            // Journal entry-specific computed sort fields, overriding generic ones if needed
-            const sort_val = (obj.sort ?? 0).toString().padStart(3, '0');
+            // Journal entry-specific computed sort fields via build_tmp_sort.
+            // Order: priority DESC → sort ASC → name ASC → updated ASC (all ascending, no .reverse())
             const updated =
                 obj.updated_on ?? obj.created_on ?? new Date(0).toISOString();
-            obj.tmp_sort_1 = `${obj.group ?? ''}_${obj.priority ? '1' : '0'}_${
-                sort_val
-            }_${updated}`;
-            obj.tmp_sort_2 = `${obj.group ?? ''}_${obj.priority ? '1' : '0'}_${
-                sort_val
-            }_${obj.name ?? ''}_${updated}`;
-            obj.tmp_sort_3 = `${obj.group ?? ''}_${obj.priority ? '1' : '0'}_${
-                sort_val
-            }_${obj.name ?? ''}_${updated}`;
+            const { tmp_sort_1, tmp_sort_2, tmp_sort_3 } = build_tmp_sort({
+                prefix: [obj.group ?? ''],
+                priority: obj.priority,
+                sort: obj.sort,
+                fields_2: [obj.name],
+                fields_3: [updated]
+            });
+            obj.tmp_sort_1 = tmp_sort_1;
+            obj.tmp_sort_2 = tmp_sort_2;
+            obj.tmp_sort_3 = tmp_sort_3;
 
             return obj;
         }

src/routes/events/[event_id]/(launcher)/launcher_session_view.svelte

@@ -90,11 +90,11 @@ let lq__event_file_obj_li = $derived.by(() => {
 });
 
 // Event Presentation
-// WHY: $derived.by — same reason as above. Captures both id and sort_by in the outer
-// closure so a new Observable is created whenever the session or its type changes.
+// WHY: $derived.by — captures id in the outer closure so a new Observable is
+// created whenever the session changes. tmp_sort_2 encodes the full sort chain:
+// priority DESC → sort ASC → start_datetime ASC → code ASC → name ASC
 let lq__event_presentation_obj_li = $derived.by(() => {
     const id = slct__event_session_id;
-    const sort_by = type_code == 'poster' ? 'name' : 'start_datetime';
     return liveQuery(async () => {
         if (!id) return [];
 
@@ -105,7 +105,7 @@ let lq__event_presentation_obj_li = $derived.by(() => {
         return await db_events.presentation
             .where('event_session_id')
             .equals(id)
-            .sortBy(sort_by);
+            .sortBy('tmp_sort_2');
     });
 });
 

src/routes/events/[event_id]/(pres_mgmt)/session/[session_id]/+page.svelte

@@ -67,40 +67,18 @@ let lq__event_session_obj = $derived(
 );
 
 // 2. Presentation List Observable
-// WHY: Dexie sortBy() is single-field only. Multi-field sort requires toArray() + JS comparator.
-// Desired order: priority DESC → sort ASC → start_datetime ASC → code ASC → name ASC
+// WHY: tmp_sort_2 encodes priority DESC → sort ASC → start_datetime ASC → code ASC → name ASC
+// as a lexicographically correct string. See process_ae_obj__event_presentation_props.
 let lq__event_presentation_obj_li = $derived(
     liveQuery(async () => {
         if (log_lvl)
             console.log(
                 `[LQ] Querying Presentations for Session: ${url_session_id}`
             );
-        const results = await db_events.presentation
+        return await db_events.presentation
             .where('event_session_id')
             .equals(url_session_id)
-            .toArray();
-        return results.sort((a, b) => {
-            // priority DESC (true first)
-            const pa = a.priority ? 1 : 0;
-            const pb = b.priority ? 1 : 0;
-            if (pb !== pa) return pb - pa;
-            // sort ASC
-            const sa = a.sort ?? 0;
-            const sb = b.sort ?? 0;
-            if (sa !== sb) return sa - sb;
-            // start_datetime ASC
-            const da = a.start_datetime ?? '';
-            const db_val = b.start_datetime ?? '';
-            if (da !== db_val) return da < db_val ? -1 : 1;
-            // code ASC
-            const ca = a.code ?? '';
-            const cb = b.code ?? '';
-            if (ca !== cb) return ca < cb ? -1 : 1;
-            // name ASC
-            const na = a.name ?? '';
-            const nb = b.name ?? '';
-            return na < nb ? -1 : na > nb ? 1 : 0;
-        });
+            .sortBy('tmp_sort_2');
     })
 );
 

src/routes/journals/+page.svelte

@@ -59,7 +59,6 @@ let lq__journal_obj_li = $derived(
         return await db_journals.journal
             .where('person_id')
             .equals($ae_loc.person_id)
-            .reverse()
             .sortBy('tmp_sort_3');
     })
 );

src/routes/journals/[journal_id]/entry/[journal_entry_id]/+page.svelte

@@ -105,7 +105,6 @@ let lq__journal_obj_li = $derived(
         let results = await db_journals.journal
             .where('person_id')
             .equals($ae_loc.person_id)
-            .reverse()
             .sortBy('tmp_sort_2');
 
         // Check if results are different than the current session version stored under $journals_slct