fix(ocr): Future-proof Tesseract version check for 6+

The version check for Tesseract was explicitly checking for versions
"4." and "5." which would fail for future Tesseract versions (6, 7,
etc.). Changed the check to use TessVersion()[0] >= '4' which will
correctly handle all versions >= 4.0.

Tesseract 4+ uses:
- Different tessdata path convention (appends /tessdata to path)
- Different default OEM mode (1 = LSTM vs 0 = Legacy)

The previous explicit check would cause future Tesseract versions to
incorrectly use the legacy Tesseract 3.x code path.

Addresses remaining concern from #1412

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/lib_ccx/hardsubx.c

@@ -266,7 +266,9 @@ struct lib_hardsubx_ctx *_init_hardsubx(struct ccx_s_options *options)
 
 	int ret = -1;
 
-	if (!strncmp("4.", TessVersion(), 2) || !strncmp("5.", TessVersion(), 2))
+	// Tesseract 4+ uses different tessdata path convention and default OEM mode
+	// Use >= '4' check to handle future versions (5, 6, 7, etc.)
+	if (TessVersion()[0] >= '4')
 	{
 		char tess_path[1024];
 		if (ccx_options.ocr_oem < 0)

src/lib_ccx/ocr.c

@@ -191,7 +191,9 @@ void *init_ocr(int lang_index)
 	}
 
 	ctx->api = TessBaseAPICreate();
-	if (!strncmp("4.", TessVersion(), 2) || !strncmp("5.", TessVersion(), 2))
+	// Tesseract 4+ uses different tessdata path convention and default OEM mode
+	// Use >= '4' check to handle future versions (5, 6, 7, etc.)
+	if (TessVersion()[0] >= '4')
 	{
 		char tess_path[1024];
 		snprintf(tess_path, 1024, "%s%s%s", tessdata_path, "/", "tessdata");