fix: remove prescreen tab, use bulk bar select+prescreen only

- drop standalone Pre-screen tab (textarea upload) — confusing duplicate
- bulk bar Pre-screen Selected button is the only entry point now
- add prescreening flag with loading state on button + double-click guard
- remove dead prescreenInput/prescreenRunning/prescreenResult state vars and runPrescreen()

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

app/static/beauty/index.html

@@ -102,7 +102,6 @@ textarea{width:100%;resize:vertical;font-family:monospace;font-size:12px}
     <button class="tab-btn" :class="{active:tab==='browse'}"    @click="tab='browse';loadDomains()">Browse</button>
     <button class="tab-btn" :class="{active:tab==='validator'}" @click="tab='validator';loadValStatus()">Validator</button>
     <button class="tab-btn" :class="{active:tab==='pipeline'}"  @click="tab='pipeline';loadLeads()">B2B Pipeline</button>
-    <button class="tab-btn" :class="{active:tab==='prescreen'}" @click="tab='prescreen'">Pre-screen</button>
     <button class="tab-btn" :class="{active:tab==='export'}"    @click="tab='export'">Export</button>
   </div>
 </div>
@@ -160,7 +159,10 @@ textarea{width:100%;resize:vertical;font-family:monospace;font-size:12px}
   <!-- Bulk bar (visible when items selected) -->
   <div class="bulk-bar" x-show="selected.length>0">
     <span style="color:var(--accent);font-weight:600;font-size:12px" x-text="selected.length+' selected'"></span>
-    <button class="btn-ok btn-sm"      @click="prescreenSelected()">Pre-screen Selected</button>
+    <button class="btn-ok btn-sm" @click="prescreenSelected()" :disabled="prescreening">
+      <span x-show="!prescreening">Pre-screen Selected</span>
+      <span x-show="prescreening">Screening…</span>
+    </button>
     <button class="btn-primary btn-sm" @click="assessSelected()">B2B Assess Selected</button>
     <button class="btn-secondary btn-sm" @click="selected=[]">Clear</button>
   </div>
@@ -381,22 +383,6 @@ textarea{width:100%;resize:vertical;font-family:monospace;font-size:12px}
 </div>
 
 <!-- ══════════════════════ PRE-SCREEN ══════════════════════ -->
-<div x-show="tab==='prescreen'" class="section-pad" style="padding-top:16px">
-  <p style="color:var(--muted);font-size:12px;margin-bottom:12px">
-    <strong style="color:var(--text)">Phase 1</strong> — HTTP check: marks domains live / dead / parked / redirect / error.<br>
-    <strong style="color:var(--text)">Phase 2</strong> — DeepSeek classifies niche (beauty_cosmetics, fashion_retail…) and site type (ecommerce, corporate…).<br>
-    Paste up to 200 domains, one per line. Results saved automatically — then use Browse to filter by beauty + ecommerce.
-  </p>
-  <textarea x-model="prescreenInput" rows="12" placeholder="domain1.com&#10;domain2.es&#10;domain3.fr&#10;…"></textarea>
-  <div style="display:flex;gap:10px;margin-top:10px;align-items:center;flex-wrap:wrap">
-    <button class="btn-primary" @click="runPrescreen()" :disabled="prescreenRunning">
-      <span x-show="!prescreenRunning">Run Pre-screen</span>
-      <span x-show="prescreenRunning">Running…</span>
-    </button>
-    <span x-show="prescreenResult" style="font-size:12px" x-text="prescreenResult"></span>
-  </div>
-</div>
-
 <!-- ══════════════════════ EXPORT ══════════════════════ -->
 <div x-show="tab==='export'" class="section-pad" style="padding-top:24px">
   <div class="card" style="max-width:460px">
@@ -444,7 +430,7 @@ function app() {
     valSt: {running:false,processed:0,live:0,dead:0,error:0,parked:0,redirect:0,skipped:0,offset:0,rate:0},
     valTld: '', valRescan: false,
     toasts: [],
-    prescreenInput: '', prescreenRunning: false, prescreenResult: '',
+    prescreening: false,
     exportQuality: '', exportCountry: '',
     f: {keyword:'', tld:'', prescreen_status:'live', niche:'beauty_cosmetics',
         site_type:'ecommerce', country:'', limit:'100', page:1},
@@ -530,7 +516,8 @@ function app() {
     },
 
     async prescreenSelected() {
-      if (!this.selected.length) return;
+      if (!this.selected.length || this.prescreening) return;
+      this.prescreening = true;
       this.notify(`Pre-screening ${this.selected.length} domains…`, 'info');
       try {
         const chunks = [];
@@ -549,6 +536,7 @@ function app() {
         this.selected = [];
         await this.loadDomains();
       } catch(e) { this.notify('Pre-screen failed: '+e.message, 'error'); }
+      finally { this.prescreening = false; }
     },
 
     async assessSelected() {
@@ -601,22 +589,6 @@ function app() {
         .catch(()=> this.notify('Copy failed', 'error'));
     },
 
-    async runPrescreen() {
-      const lines = this.prescreenInput.split('\n').map(l=>l.trim()).filter(Boolean);
-      if (!lines.length) { this.notify('No domains entered', 'error'); return; }
-      if (lines.length > 200) { this.notify('Max 200 per batch', 'error'); return; }
-      this.prescreenRunning = true; this.prescreenResult = '';
-      try {
-        const d = await fetch('/api/prescreen/batch', {
-          method:'POST', headers:{'Content-Type':'application/json'},
-          body: JSON.stringify({domains: lines}),
-        }).then(r=>r.json());
-        this.prescreenResult = `✅ ${d.live} live · ☠ ${d.dead} dead · 🅿 ${d.parked} parked · ↗ ${d.redirect} redirect · 🏷 ${d.classified} classified`;
-        this.notify(this.prescreenResult, 'success');
-      } catch(e) { this.notify('Failed: '+e.message, 'error'); }
-      finally { this.prescreenRunning = false; }
-    },
-
     async startValidator() {
       const p = new URLSearchParams();
       if (this.valTld) p.set('tld', this.valTld);