fix: reduce svelte-check warnings from 175 to 95 (80 eliminated)

Svelte 5 reactivity pattern fixes:
- Convert prop/data captures to $derived where used in reactive contexts
- Wrap store assignments in $effect + untrack for ae_acct pattern
- Move sign_in_out URL param processing to onMount (from top-level if(browser))
- Wrap debug console.log blocks in $effect instead of top-level if(log_lvl)
- Fix $state initializers reading props directly ($state(link_to_id) → $state(''))
- Fix box = $state(null) in journals layout

CSS fixes:
- TipTap scss: change :global(.tiptap){nested} to :global{.tiptap{nested}} so
  Svelte does not scope-hash dynamic content selectors (latent CSS bug fixed)
- element_manage_hosted/event: dq__where vars → $derived for reactive liveQuery

Config:
- svelte.config.js: add onwarn (suppresses a11y/CSS in Vite pipeline; note:
  svelte-check 4.x does not read onwarn so CLI count unchanged)

Remaining 95 warnings (acceptable baseline):
- 70x a11y_label: form labels need for/id attributes (proper a11y fix deferred)
- 12x lu_* false positives in IDAA async callbacks (correct code)
- 8x CSS dynamic selectors Svelte cannot detect at compile time
- 5x other intentional patterns (autofocus, form state, log_lvl callbacks)

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

@@ -43,7 +43,7 @@
     import AeCompModalJournalImport from '../ae_comp__modal_journal_import.svelte';
 
     // Variables
-    let ae_acct = data[data.account_id];
+    let ae_acct = $derived(data[data.account_id]);
     let show_export_modal = $state(false);
     let show_import_modal = $state(false);
 
@@ -59,8 +59,13 @@
         $journals_loc.entry.search_version++;
     }
 
-    $journals_slct.journal_id = ae_acct.slct.journal_id;
-    $journals_slct.journal_entry_id = null;
+    $effect(() => {
+        if (!ae_acct) return;
+        untrack(() => {
+            $journals_slct.journal_id = ae_acct.slct.journal_id;
+            $journals_slct.journal_entry_id = null;
+        });
+    });
 
     let lq__journal_obj = $derived(
         liveQuery(async () => {