feat(layout-review): address review findings on pages 4-6

Find Unusual Values (06_outlier_detector) — coming-soon stub:
- Anchor the disabled Method on IQR (multiplier 1.5), not Z-score, per
  the logged robustness decision.
- Drop the redundant feature bullet list (kept alert + greyed controls
  + disabled button); also fixes the MAD-only-in-bullets mismatch.
- Remove the live uploader that dead-ended into disabled controls.

Clean Text (02_text_cleaner):
- Add an inline hidden-character legend (3 swatches reusing the actual
  badge classes) beside the canonical "Show hidden characters" toggle.
- Unify the two hidden-char toggles: preview one is canonical; the
  Results bare checkbox is wrapped in a field + bound note.
- Describe all three presets (minimal / excel-hygiene / paranoid).
- Give "Changes by column" a real "column" header instead of the
  grey index-gutter style.

Standardize Formats (03_format_standardizer):
- Make preset-vs-control precedence legible: preset shows Custom with a
  "modified" marker + base tag, diverging controls flag the winning
  value (same pattern as Fix Missing Values).
- Replace the dead-end unparseable alert with a real "Unparseable
  cells (47)" expander the alert now points to.
- Honest preview caption: "5 of 6 columns (notes skipped)".
Intake pattern (the cross-page reference) left untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

layout-review/06_outlier_detector.html

@@ -12,7 +12,7 @@
   <main class="dt-main">
     <div class="dt-review-banner">
       <span class="dt-mi">visibility</span>
-      <span>Static layout preview of <strong>Find Unusual Values</strong> — a <strong>Coming&nbsp;Soon</strong> tool. The page is a stub/teaser: an "under development" notice, a list of planned features, and disabled placeholder controls (only the file uploader is live). <a href="index.html">All pages →</a></span>
+      <span>Static layout preview of <strong>Find Unusual Values</strong> — a <strong>Coming&nbsp;Soon</strong> tool. The page is a stub/teaser: an "under development" notice and disabled placeholder controls. <a href="index.html">All pages →</a></span>
     </div>
     <div class="dt-main-inner">
 
@@ -31,40 +31,14 @@
         <span>This tool is under development.</span>
       </div>
 
-      <!-- Planned features (st.markdown) -->
-      <p><strong>Features:</strong></p>
-      <ul>
-        <li>Z-score detection (configurable threshold)</li>
-        <li>IQR (interquartile range) detection</li>
-        <li>MAD (median absolute deviation) detection</li>
-        <li>Domain-rule violations (e.g., age &lt; 0, price &gt; $1M)</li>
-        <li>Visual outlier highlighting in data preview</li>
-        <li>Handling: flag only, remove, cap/winsorize to bounds</li>
-      </ul>
-
       <hr class="dt-divider">
 
-      <!-- File upload (functional) -->
-      <label class="dt-label">Import CSV or Excel file</label>
-      <div class="dt-uploader">
-        <div class="dt-uploader-text">
-          <span class="hint"><span class="dt-mi" style="vertical-align:-4px">upload_file</span> Drag and drop file here</span>
-          <span class="sub">CSV, TSV, XLSX, XLS · Import a file to preview. Processing is not yet available.</span>
-        </div>
-        <button class="dt-btn">Browse files</button>
-      </div>
-
       <!-- Placeholder options (all disabled) -->
       <h3>Detection Method</h3>
 
       <div class="dt-field" style="max-width:420px">
         <label class="dt-label">Method</label>
-        <div class="dt-select" style="opacity:.55;cursor:not-allowed">Z-Score</div>
-      </div>
-
-      <div class="dt-field" style="max-width:420px;opacity:.55">
-        <label class="dt-label">Z-Score threshold</label>
-        <div class="dt-slider"><div class="track"><div class="fill" style="width:50%"></div><div class="knob" style="left:50%"></div></div><div class="val">3.0</div></div>
+        <div class="dt-select" style="opacity:.55;cursor:not-allowed">IQR (interquartile range)</div>
       </div>
 
       <div class="dt-field" style="max-width:420px;opacity:.55">