RRLS modal: clarify Line Present (gate) vs line (Line Type — descriptive)

User feedback: my previous copy conflated the 5-point "Line Present"
extraction gate with the 3-value "Line Type" classification dimension —
two completely separate fields with different enums that answer different
questions.

Splits the "How a span qualifies" section into two clearly-labelled cards
(① gate / ② descriptive) showing:
  - the 5-point Line Present scale with PASS/FAIL explicit per value
    (PASS = Clearly yes OR More yes than no; FAIL on Hard to tell,
    More no than yes, Clearly no — for BOTH Line Present AND Threat
    Present independently)
  - the 3-value Line Type enum (Explicit / Quasi / Vague) as a
    descriptive dimension applied only to spans that already passed
    the gate
  - explicit note that "Line Present = Clearly yes" + "line = Vague Line"
    is a valid, non-contradictory combination

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: sdspieg

src/components/RRLSExplorer.tsx

@@ -231,14 +231,57 @@ export default function RRLSExplorer() {
             <span className="tab-info-pill"><b>17</b> taxonomy dimensions</span>
           </div>
 
-          <h4>How a span qualifies</h4>
+          <h4>How a span qualifies — two independent fields, often confused</h4>
           <p>
-            Each candidate span is independently scored on a 5-point scale (
-            <code>Clearly yes / More yes than no / Hard to tell / More no than yes / Clearly no</code>)
-            for both <b>Line Present</b> and <b>Threat Present</b>. A span enters
-            the confirmed RRLS set only when <b>both reach at least "More yes than
-            no"</b>. The Line need not be sharp — vague and quasi-lines qualify
-            as long as a triggering condition is articulated in the text.
+            The pipeline produces <b>two completely separate fields about the
+            line</b>. Don't conflate them — they answer different questions and
+            use different enums.
+          </p>
+          <div className="tab-info-grid">
+            <div className="tab-info-card">
+              <h4>① Line Present <span style={{color:'var(--text-secondary)',fontWeight:400}}>(gate)</span></h4>
+              <p>
+                Asked during <b>extraction</b>. "Is a line articulated <i>at
+                all</i> in this span?" The extractor picks one of five values;
+                <b> only the top two count as PASS</b>:
+              </p>
+              <ul style={{listStyle:'none',paddingLeft:0,fontFamily:'ui-monospace,monospace',fontSize:'.82rem',lineHeight:1.7}}>
+                <li><b style={{color:'#3fb950'}}>✓ PASS</b> &nbsp; Clearly yes</li>
+                <li><b style={{color:'#3fb950'}}>✓ PASS</b> &nbsp; More yes than no</li>
+                <li><b style={{color:'#ff7b72'}}>✗ FAIL</b> &nbsp; Hard to tell</li>
+                <li><b style={{color:'#ff7b72'}}>✗ FAIL</b> &nbsp; More no than yes</li>
+                <li><b style={{color:'#ff7b72'}}>✗ FAIL</b> &nbsp; Clearly no</li>
+              </ul>
+              <p>
+                A span enters the confirmed RRLS set only when <b>BOTH</b>{' '}
+                Line Present <b>AND</b> Threat Present PASS independently —
+                i.e. each is either "Clearly yes" or "More yes than no". One
+                FAIL on either side drops the span.
+              </p>
+            </div>
+            <div className="tab-info-arrow">+</div>
+            <div className="tab-info-card">
+              <h4>② line <span style={{color:'var(--text-secondary)',fontWeight:400}}>(Line Type — descriptive)</span></h4>
+              <p>
+                Asked during <b>classification</b>, only for spans that already
+                passed the gate. "For this admitted span, how <i>sharp</i> is
+                the articulated boundary?" Pick one:
+              </p>
+              <p style={{fontFamily:'ui-monospace,monospace',fontSize:'.8rem',color:'var(--color-gold)'}}>
+                Explicit Line · Quasi-Line · Vague Line
+              </p>
+              <p>
+                A span can score <code>Line Present = Clearly yes</code> AND{' '}
+                <code>line = Vague Line</code>. That's not a contradiction —
+                it means "yes a line was clearly articulated, and the
+                articulation is vague."
+              </p>
+            </div>
+          </div>
+          <p>
+            So the dual-condition gate (field ①) admits the span; the Line Type
+            classification (field ②) then describes how sharp the boundary is
+            among admitted spans. The two enums are independent.
           </p>
 
           <h4>How RRLS differs from the other annotation layers</h4>