fix: remove unused import, add duplicate redaction detection

- Remove unused detect_redactions import from app.py
- Add de-duplication check in dblclick handler to prevent
  creating duplicate redaction entries for the same dark region

Co-Authored-By: Claude Opus 4.6 <[email protected]>

unredact/app.py

@@ -17,7 +17,7 @@ from PIL import Image, ImageFont
 from sse_starlette.sse import EventSourceResponse
 
 from unredact.pipeline.rasterize import rasterize_pdf
-from unredact.pipeline.detect_redactions import detect_redactions, spot_redaction
+from unredact.pipeline.detect_redactions import spot_redaction
 from unredact.pipeline.ocr import ocr_page
 from unredact.pipeline.font_detect import detect_font_for_line, CANDIDATE_FONTS, _find_font_path
 from unredact.pipeline.solver import build_constraint, SolveResult

unredact/static/app.js

@@ -915,6 +915,18 @@ rightPanel.addEventListener("dblclick", async (e) => {
 
     const data = await resp.json();
     const box = data.box;
+
+    // De-duplicate: if a redaction with the same box already exists, just activate it
+    const existingDup = Object.values(state.redactions).find(r =>
+      r.page === state.currentPage &&
+      Math.abs(r.x - box.x) < 3 && Math.abs(r.y - box.y) < 3 &&
+      Math.abs(r.w - box.w) < 3 && Math.abs(r.h - box.h) < 3
+    );
+    if (existingDup) {
+      activateRedaction(existingDup.id);
+      return;
+    }
+
     const id = "m" + Date.now().toString(36);
 
     state.redactions[id] = {