chore: initialize repository baseline

Import the existing Electron + React + TypeScript app as the version-control
baseline before the scanner rework (C# input/capture sidecar, resolution-anchored
layout profiles, OCR preprocessing, eval harness, rescan-merge, GOOD interop).

Housekeeping in this commit:
- Remove orphaned temp_inputhelper_block.ts (duplicate of the input-helper script).
- Ignore .claude/scheduled_tasks.lock local session state.
- Add .gitattributes to normalize line endings (LF in repo).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/PROMPTS.md

@@ -0,0 +1,37 @@
+# Prompts
+
+## Scanner Bug Report
+
+Use this when reporting a capture/OCR issue:
+
+```text
+Genshin resolution:
+Display scaling:
+Selected source:
+Expected crop:
+Actual crop:
+Screenshot of scan page:
+Screenshot of Details modal:
+OCR candidates text:
+```
+
+## Feature Request
+
+```text
+Goal:
+User workflow:
+Must-have behavior:
+Nice-to-have behavior:
+Safety constraints:
+Validation idea:
+```
+
+## Review Request
+
+```text
+Please review this change for:
+- scanner safety
+- parser correctness
+- UI clarity
+- validation gaps
+```