Release v0.6.8: add background image OCR and optional Tesseract

README.md

@@ -90,7 +90,7 @@ broker can load them even when the profile directory is inaccessible to it.
 Notifications expire after 24 hours. Cache cleanup runs on capture/open; each cache is bounded to
 40 files and 256 MiB. Expired or evicted notifications cannot reopen their screenshot.
 In the editor, **Ctrl+C** or **Enter** copies the current result without closing the window.
-The editor starts with **Pointer (V)**: select objects, move them, and edit geometry, thickness and
+The editor starts with **Pencil / Freehand (F)** for drawing. Choose **Pointer (V)** to select objects, move them, and edit geometry, thickness and
 other properties using handles and controls. Clicking empty space clears selection; dragging empty
 space adds nothing. Choose a drawing tool to create objects, then return to **V** to edit them.
 The cursor identifies the active tool: pointer, text caret, pencil, or a crosshair with the drawing
@@ -223,8 +223,24 @@ thumbnails and source labels aligned with the scaled fonts and spacing.
   stylesheet rules are not reproduced; preview text uses the list's colors for readability.
 - Consecutive screenshot copies are compared by image content, ignoring changing OLE transport
   metadata (including Snipping Tool's repeated clipboard publication).
-- Windows OCR, entirely native and offline. Right-click an image in history and select
-  **Copy text from image**. Requires a Windows OCR language installed for the user profile.
+- New images are recognized automatically in a separate background worker using native, offline
+  Windows OCR. Recognized text is saved in a per-user DPAPI-encrypted sidecar and included in search,
+  without changing the image or clipboard. Completed results (including empty text) are reused;
+  pending work resumes after restart. Older images without OCR are processed once in the background,
+  starting with the newest entries.
+  Right-click an image and select **Copy text from image** to copy the saved text or explicitly
+  retry recognition. Requires a Windows OCR language installed for the user profile; automatic
+  failures are logged quietly. OCR sidecars count toward the history size limit and are removed
+  with their images.
+- Optional Tesseract 5 support is available in **Settings → OCR options…**. Windows OCR remains
+  the default and has no Tesseract dependency. Install the 64-bit Tesseract 5 Windows package
+  separately, then enable it and choose language codes such as `ukr+eng+rus`. Leave the executable
+  path blank to detect a standard installation, or select `tesseract.exe`; its neighboring
+  `libtesseract-5.dll`, dependencies and `tessdata` language files are required. **Check installation**
+  validates the selected models. **Download Tesseract…** opens the Windows installer page in your
+  browser. No packages or models are downloaded automatically.
+  Tesseract processes screenshots locally in memory with a 30-second recognition deadline.
+  Changing engine, executable path or languages refreshes cached image text in the background.
 - History exclusion flags and excluded processes, pause/resume, count/size limits.
 - Per-user Windows DPAPI encryption for both history payloads and the preview index.
 - Autostart, keep-screen-awake, idle-only F15 activity signal, settings import/export.