fix: reduce false OCR recommendations for text PDFs with figures (#38)

* fix: reduce false OCR recommendations for text PDFs with figure images

Two fixes in the detector:

1. Fix Tf operator parsing: some PDFs concatenate Tf directly with the
   next operator (e.g. "25 Tf[<01>...") without whitespace. The scanner
   now accepts [, (, <, / as valid followers, fixing font_changes being
   reported as 0.

2. Distinguish text-with-figures from scanned-with-OCR: pages with
   multiple images (image_count > 1) and strong text signals (text_ops
   >= 50, alphanum >= 10) are recognized as text pages with figures,
   not scanned templates. Scanned PDFs have exactly 1 full-page image.

This prevents academic papers, reports with charts, and similar PDFs
from being incorrectly classified as Mixed/OCR-needed when their text
is perfectly extractable.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: bump napi version to 0.7.2

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: remove template image influence from page classification

Template images (large background/figure images) no longer affect
pages_needing_ocr. In the region-based pipeline, text regions are
extracted independently from image regions, and per-region needs_ocr
quality checks handle scanned-with-OCR garbage text.

Also makes the invisible text retry (for OCR text layers) trigger on
text quality rather than PDF type, so it works regardless of
classification.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Revert "fix: remove template image influence from page classification"

This reverts commit 100cbe5453.

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

napi/package.json

@@ -1,6 +1,6 @@
 {
   "name": "firecrawl-pdf-inspector",
-  "version": "0.7.1",
+  "version": "0.7.2",
   "description": "Fast PDF classification and text extraction. Detect text-based vs scanned PDFs, extract text by region with quality checks. Native Rust performance via napi-rs.",
   "main": "index.js",
   "types": "index.d.ts",