Clean up LSP diagnostics across backend and frontend

Backend (nvcurve/):
- hal/fans.py, hal/limits.py, hal/gpu.py: replace conditional pynvml
  imports with the established 'pynvml: Any = _pynvml_import' pattern
  (fixes ~50 'possibly unbound' errors); type the result dicts; guard
  query_interface() results; explicit uuid/pci-bus parsing (int, hex
  convention documented); modernize Optional[T] -> T | None
- cli.py: fix 'curve_state' possibly-unbound and snap_path None handling
  in cmd_setup; wrap unchecked int()/open()/makedirs() calls in
  try/except with clean CLI errors; add module logger for silent
  except-pass blocks; raise ... from exc; fix unused loop vars and
  set-comprehension
- hal/snapshot.py: filepath: str | None; wrap all file ops; sorted
  imports; remove unused CT_POINTS import
- daemon.py: extract 0o666 to _SOCKET_MODE constant (intentional for
  /run sockets) with nosemgrep
- server.py: nosemgrep for Python 3.7-compat false positive (project
  requires >= 3.12); log previously-swallowed exception
- profiles/native.py, profiles/apply.py: wrap file ops and int(k)
  profile-key parsing; sorted imports; modernize typing

Frontend (frontend/src):
- Add .js extensions to all relative imports (standard TS-ESM; Vite
  resolves .js -> .ts)
- React.FormEvent (deprecated in React 19 types) -> React.SubmitEvent
- catch (e: any) -> catch (e: unknown) + instanceof Error narrowing
- React-hooks: move ref writes from render into effects; convert
  viewport reset to render-phase state adjustment; split
  selectPoint(index, multi) into selectPoint + togglePoint (no flag
  argument); remove non-null assertion
- Static inline styles -> Tailwind classes (dynamic positioning/cursor
  styles kept)
- Remove non-standard 'container' option from scrollIntoView (browsers
  ignore unknown options) which had orphaned a @ts-expect-error
- Object.fromEntries for Map -> Record conversion

Tooling:
- .gitignore: ignore .codegraph/ local tool data

Verified: tsc --noEmit, vite production build, python imports, and
full LSP scan (0 errors/warnings in both projects).

frontend/src/components/common/ConfirmDialog.tsx

@@ -10,16 +10,17 @@ interface Props {
 export function ConfirmDialog({
   message,
   detail,
-  confirmLabel = 'Confirm',
+  confirmLabel = "Confirm",
   isDestructive = false,
   onConfirm,
   onCancel,
 }: Props) {
   return (
     <div
-      className="fixed inset-0 z-50 flex items-center justify-center"
-      style={{ background: 'rgba(0,0,0,0.7)' }}
-      onMouseDown={(e) => { if (e.target === e.currentTarget) onCancel(); }}
+      className="fixed inset-0 z-50 flex items-center justify-center bg-black/70"
+      onMouseDown={(e) => {
+        if (e.target === e.currentTarget) onCancel();
+      }}
     >
       <div className="bg-zinc-900 border border-zinc-700 rounded-xl shadow-2xl p-6 w-96 max-w-[90vw]">
         <h2 className="text-zinc-100 font-semibold text-sm mb-1">{message}</h2>
@@ -35,11 +36,11 @@ export function ConfirmDialog({
           <button
             onClick={onConfirm}
             className={[
-              'px-3 py-1.5 rounded text-xs font-semibold transition-colors',
+              "px-3 py-1.5 rounded text-xs font-semibold transition-colors",
               isDestructive
-                ? 'bg-red-600 hover:bg-red-500 text-white'
-                : 'bg-emerald-600 hover:bg-emerald-500 text-white',
-            ].join(' ')}
+                ? "bg-red-600 hover:bg-red-500 text-white"
+                : "bg-emerald-600 hover:bg-emerald-500 text-white",
+            ].join(" ")}
           >
             {confirmLabel}
           </button>