feat: lenient JSON repair for pasted MCP snippets

Pasted config snippets no longer have to be valid JSON. repair_json_text()
auto-fixes markdown fences, surrounding prose, // /* */ # comments,
trailing and missing commas, smart quotes, single quotes, unquoted keys,
Python/JS literals, and unclosed braces. parse_pasted_json_verbose()
reports every repair applied; the paste dialog now parses as you type
and previews exactly what will be added and what was fixed.

Also includes ruff lint fixes and formatting across bcc.py/bcc_core.py.

CLAUDE.md

@@ -8,10 +8,14 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 # Install runtime dependency
 pip install -r requirements.txt
 python bcc.py          # run the GUI
-python test_core.py    # run unit tests (23 tests, no GUI needed)
+
+# Test & lint (no GUI / PySide6 needed — tests only exercise bcc_core)
+pip install -r requirements-dev.txt
+python -m pytest       # unit tests in tests/
+ruff check .           # lint
+ruff format .          # format (CI enforces ruff format --check)
 
 # Build a self-contained binary
-pip install -r requirements-dev.txt
 python scripts/build_icons.py   # regenerate icons/app.icns + icons/app.ico if needed
 pyinstaller bcc.spec
 # macOS  → dist/BetterClaudeConfig.app
@@ -19,7 +23,7 @@ pyinstaller bcc.spec
 # Linux  → dist/BetterClaudeConfig
 ```
 
-Requires Python 3.10+. Runtime dependency: `PySide6>=6.6`. Build-time: `pyinstaller>=6.0`, `pillow>=10.0`.
+Requires Python 3.10+. Runtime dependency: `PySide6>=6.6`. Tooling config (ruff, pytest, project metadata) lives in `pyproject.toml`. CI (`.github/workflows/ci.yml`) runs lint + tests on every push/PR; releases build on tag push (`release.yml`).
 
 ## Architecture
 
@@ -29,7 +33,7 @@ The codebase is split into two layers:
 - `Profile` / `ServerEntry` dataclasses (the data model)
 - `discover_profiles()` — scans the platform's app-support directory for `Claude*` folders (Claude Desktop) **and** always adds `~/.claude/settings.json` (Claude Code, cross-platform)
 - `load_config` / `extract_servers` / `apply_servers` / `write_config` — the read/write pipeline; writes are atomic with rotating timestamped backups in `.bcc_backups/`
-- `parse_pasted_json()` — accepts three JSON shapes (full config, inner map, or bare server object)
+- `parse_pasted_json()` / `parse_pasted_json_verbose()` — accepts three JSON shapes (full config, inner map, or bare server object). Input does not have to be valid JSON: `repair_json_text()` auto-fixes markdown fences, surrounding prose, `//` `/* */` `#` comments, trailing/missing commas, smart quotes, single quotes, unquoted keys, Python/JS literals, and unclosed braces. The verbose variant also returns human-readable notes describing every repair applied (shown live in the paste dialog)
 - `check_dependency()` / `diagnostics_text()` / `pin_command_path()` — PATH resolution logic; distinguishes "found on normal PATH" (ok) vs "found only on augmented PATH" (warn) vs "not found" (missing). Uses an `lru_cache`-memoized `augmented_path()` that extends the inherited PATH with common runtime locations (nvm, homebrew, cargo, volta, etc.)
 - `test_remote()` — synchronous HTTP reachability check, intended to run off the UI thread