Fix bugs across app + server, optimize UI/UX, add Gitea CI

Bug fixes (Flutter):
- Wrap multi-statement DB writes (insert/update/delete note, deleteDocument,
  deletePageData, OCR FTS merge, migrations) in transactions to prevent data
  loss on interruption and a read-modify-write FTS race.
- Fix PdfDocument leaks on exception (try/finally dispose) and preserve image
  aspect ratio when stamping images onto PDF pages.
- Guard file-picker against empty selection (was .single -> crash).
- Fix eraser ConcurrentModificationError and unmodifiable-list crash on PDF
  pages; capture page synchronously on save to stop wrong-page data loss.
- Fix Riverpod DB-not-ready races, broken pull-to-refresh, settings load race,
  and search N+1; transform stored annotations on PDF page rotation.
- Normalize pen pressure for devices without a pressure range.
- PPT: single source of truth for slide strokes so ink displays and exports.

UI/UX:
- Material 3 typography, theme-aware colors (dark-mode fixes), hover cursors
  and right-click/visible actions on desktop, keyboard shortcuts (undo/redo/
  save/find), toolbar overflow handling, friendlier empty states, semantic OCR
  status badges, relative timestamps, 1-based page indicators, large-deck PPT
  navigation, and a scratchpad-scope label in split view.

Server (optional backend):
- Persist JWT secret (was per-process random), block path traversal in storage,
  fix CORS '*'+credentials, add OCR job ownership checks, last-writer-wins sync
  guard, constant-time login, and split out heavy OCR deps so the API/tests run
  without them.

CI: Gitea workflows for format+analyze+test (Linux, system sqlite) and a
Windows release build; pristine `flutter analyze`, all Flutter and server tests
green.

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

server/badnote_server/ocr/queue.py

@@ -0,0 +1,136 @@
+"""File-based OCR job queue for BadNote."""
+
+import json
+import os
+import shutil
+from datetime import datetime, timezone
+from uuid import uuid4
+
+from ..config import settings
+
+
+def _queue_dir(subdir: str) -> str:
+    path = os.path.join(settings.queue_path, subdir)
+    os.makedirs(path, exist_ok=True)
+    return path
+
+
+def _job_path(job_id: str, subdir: str) -> str:
+    return os.path.join(_queue_dir(subdir), f"{job_id}.json")
+
+
+def _read_job(path: str) -> dict | None:
+    try:
+        with open(path, "r") as f:
+            return json.load(f)
+    except (FileNotFoundError, json.JSONDecodeError):
+        return None
+
+
+def _write_job(path: str, data: dict) -> None:
+    with open(path, "w") as f:
+        json.dump(data, f, indent=2)
+
+
+def enqueue(job_data: dict) -> str:
+    """Add a job to the pending queue. Returns job_id."""
+    job_id = job_data.get("id", str(uuid4()))
+    job_data["id"] = job_id
+    job_data["status"] = "pending"
+    job_data["created_at"] = datetime.now(timezone.utc).isoformat()
+    _write_job(_job_path(job_id, "pending"), job_data)
+    return job_id
+
+
+def dequeue() -> dict | None:
+    """Move the first pending job to processing. Returns job dict or None."""
+    pending_dir = _queue_dir("pending")
+    try:
+        files = sorted(os.listdir(pending_dir))
+    except FileNotFoundError:
+        return None
+    for fname in files:
+        if not fname.endswith(".json"):
+            continue
+        src = os.path.join(pending_dir, fname)
+        job = _read_job(src)
+        if job is None:
+            continue
+        job["status"] = "processing"
+        dst = _job_path(job["id"], "processing")
+        shutil.move(src, dst)
+        return job
+    return None
+
+
+def complete(job_id: str, result: str) -> None:
+    """Mark a job as done with result text."""
+    src = _job_path(job_id, "processing")
+    job = _read_job(src)
+    if job is None:
+        return
+    job["status"] = "done"
+    job["result_text"] = result
+    job["completed_at"] = datetime.now(timezone.utc).isoformat()
+    dst = _job_path(job_id, "done")
+    if os.path.exists(src):
+        os.remove(src)
+    _write_job(dst, job)
+
+
+def fail(job_id: str, error: str) -> None:
+    """Mark a job as failed with error message."""
+    src = _job_path(job_id, "processing")
+    job = _read_job(src)
+    if job is None:
+        return
+    job["status"] = "failed"
+    job["error_message"] = error
+    job["completed_at"] = datetime.now(timezone.utc).isoformat()
+    dst = _job_path(job_id, "failed")
+    if os.path.exists(src):
+        os.remove(src)
+    _write_job(dst, job)
+
+
+def get_status(job_id: str) -> dict | None:
+    """Check all directories for a job and return its data."""
+    for subdir in ("pending", "processing", "done", "failed"):
+        job = _read_job(_job_path(job_id, subdir))
+        if job is not None:
+            return job
+    return None
+
+
+def get_jobs_for_note(note_id: str) -> list[dict]:
+    """Return all completed OCR jobs for a given note_id."""
+    results = []
+    for subdir in ("done", "pending", "processing", "failed"):
+        dir_path = _queue_dir(subdir)
+        try:
+            for fname in os.listdir(dir_path):
+                if not fname.endswith(".json"):
+                    continue
+                job = _read_job(os.path.join(dir_path, fname))
+                if job and job.get("note_id") == note_id:
+                    results.append(job)
+        except FileNotFoundError:
+            pass
+    return results
+
+
+def get_jobs_for_document(document_id: str) -> list[dict]:
+    """Return all OCR jobs for a given document_id."""
+    results = []
+    for subdir in ("done", "pending", "processing", "failed"):
+        dir_path = _queue_dir(subdir)
+        try:
+            for fname in os.listdir(dir_path):
+                if not fname.endswith(".json"):
+                    continue
+                job = _read_job(os.path.join(dir_path, fname))
+                if job and job.get("document_id") == document_id:
+                    results.append(job)
+        except FileNotFoundError:
+            pass
+    return results