style: Phase 1+2 — FA→Lucide, variant-* → preset-*, dark mode forms

Phase 1 (global quick wins):
- app.css: add global dark mode utility for .input/.select/.textarea
- events menu nav + layout: replace all FontAwesome icons with Lucide
- events settings: replace FA icons, standardize variant-* → preset-*

Phase 2 (module-by-module migration):
- root +layout.svelte: fix hardcoded banner colors → preset-filled-error/warning
- journals entry list: replace slate-* with gray-*, HSL eye colors → CSS tokens
- pres mgmt presenter view: variant-soft-warning → preset-tonal-warning, FA edit → Lucide
- badges (4 files): variant-* → preset-*, FA spinner → Lucide Loader2, dynamic alert fix
- events session list + event hub: variant-soft/filled → preset-tonal/filled
- leads module (12 files): complete variant-* → preset-* migration across all
  exhibitor sign-in, QR scanner, manual search, tracking list, manage tab,
  custom questions, license list, exhibit page, lead detail page + form

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

src/routes/events/ae_comp__events_menu_nav.svelte

@@ -8,6 +8,7 @@
         slct,
         slct_trigger
     } from '$lib/stores/ae_stores';
+    import { TrendingUp, MapPin, Wrench, Search, GraduationCap, Plane, Settings } from '@lucide/svelte';
 
     interface Props {
         // import { events_loc, events_sess, events_slct, events_trigger, events_trig_kv } from '$lib/stores/ae_events_stores';
@@ -64,7 +65,7 @@
             class="btn btn-sm mx-1 ae_btn_warning"
             class:hidden={!ae_core}
         >
-            <span class="fas fa-cogs m-1"></span>
+            <Settings size="1em" aria-hidden="true" />
             Æ Core
         </a>
 
@@ -73,7 +74,7 @@
             class="btn btn-sm mx-1 ae_btn_info"
             class:hidden={!events__reports}
         >
-            <span class="fas fa-chart-line m-1"></span>
+            <TrendingUp size="1em" aria-hidden="true" />
             Pres Mgmt Reports
         </a>
         <a
@@ -81,8 +82,7 @@
             class="btn btn-sm mx-1 ae_btn_info"
             class:hidden={!events__locations}
         >
-            <!-- <span class="fas fa-map-marker-alt m-1"></span> -->
-            <span class="fas fa-map-marked-alt m-1"></span>
+            <MapPin size="1em" aria-hidden="true" />
             Locations
         </a>
         <a
@@ -90,7 +90,7 @@
             class="btn btn-sm mx-1 ae_btn_warning"
             class:hidden={!events__settings}
         >
-            <span class="fas fa-tools m-1"></span>
+            <Wrench size="1em" aria-hidden="true" />
             Admin Tools
         </a>
     </span>
@@ -103,7 +103,7 @@
             class="btn btn-sm mx-1 ae_btn_info"
             class:hidden={!events__session_search}
         >
-            <span class="fas fa-search m-1"></span>
+            <Search size="1em" aria-hidden="true" />
             Session Search
         </a>
         <a
@@ -111,8 +111,7 @@
             class="btn btn-sm mx-1 ae_btn_info"
             class:hidden={!events__session_id}
         >
-            <!-- <span class="fas fa-arrow-left m-1"></span> -->
-            <span class="fas fa-chalkboard-teacher m-1"></span>
+            <GraduationCap size="1em" aria-hidden="true" />
             Back to Session
         </a>
         <!-- eslint-disable-next-line svelte/valid-compile -->
@@ -121,7 +120,7 @@
             class="btn btn-sm mx-1 ae_btn_info"
             class:hidden={!event_id}
         >
-            <span class="fas fa-plane m-1"></span>
+            <Plane size="1em" aria-hidden="true" />
             Launcher
         </a>
         <a
@@ -129,8 +128,7 @@
             class="btn btn-sm mx-1 ae_btn_info"
             class:hidden={!events__location_id}
         >
-            <!-- <span class="fas fa-map m-1"></span> -->
-            <span class="fas fa-map-marker-alt m-1"></span>
+            <MapPin size="1em" aria-hidden="true" />
             Session Location
         </a>
     </span>