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/Profiles/ProfilePanel.tsx

@@ -8,10 +8,14 @@ import {
   Star,
   Fan,
 } from "lucide-react";
-import { api } from "../../api/client";
-import type { ProfileData } from "../../types";
+import { api } from "../../api/client.js";
+import type { ProfileData } from "../../types.js";
 import { toast } from "sonner";
-import { useCurveStore } from "../../store/curveStore";
+import { useCurveStore } from "../../store/curveStore.js";
+
+function errMsg(e: unknown): string {
+  return e instanceof Error ? e.message : String(e);
+}
 
 interface ProfilePanelProps {
   activeProfile: string | null;
@@ -65,37 +69,42 @@ export function ProfilePanel({
       setAutoLoadProfile(name);
       if (name) toast.success(`"${name}" will load on server start`);
       else toast.success("Auto-load cleared");
-    } catch (e: any) {
-      toast.error(
-        "Failed to update default profile: " + (e.message || String(e)),
-      );
+    } catch (e: unknown) {
+      toast.error("Failed to update default profile: " + errMsg(e));
     }
   }
 
+  // Data fetch on GPU change — setState calls happen after the await, not
+  // synchronously in the effect body (rule false-positive on async fetch).
   useEffect(() => {
+    // eslint-disable-next-line react-hooks/set-state-in-effect
     fetchProfiles();
   }, [selectedGpuIndex]);
 
   useEffect(() => {
     if (isSaveOpen) saveInputRef.current?.focus();
-    else setNewName("");
   }, [isSaveOpen]);
 
   useEffect(() => {
     if (renamingName) renameInputRef.current?.focus();
   }, [renamingName]);
 
-  async function handleSave(e: React.FormEvent) {
+  function closeSaveForm() {
+    setIsSaveOpen(false);
+    setNewName("");
+  }
+
+  async function handleSave(e: React.SubmitEvent) {
     e.preventDefault();
     if (!newName.trim()) return;
     try {
       setIsSaving(true);
       await api.saveProfile(newName.trim(), selectedGpuIndex);
       toast.success(`Profile "${newName.trim()}" saved`);
-      setIsSaveOpen(false);
+      closeSaveForm();
       await fetchProfiles();
-    } catch (e: any) {
-      toast.error("Failed to save: " + (e.message || String(e)));
+    } catch (e: unknown) {
+      toast.error("Failed to save: " + errMsg(e));
     } finally {
       setIsSaving(false);
     }
@@ -107,8 +116,8 @@ export function ProfilePanel({
       await api.applyProfile(name, selectedGpuIndex);
       onProfileApplied(name);
       toast.success(`"${name}" applied`);
-    } catch (e: any) {
-      toast.error(`Failed to apply "${name}": ` + (e.message || String(e)));
+    } catch (e: unknown) {
+      toast.error(`Failed to apply "${name}": ` + errMsg(e));
     } finally {
       setApplyingName(null);
     }
@@ -123,14 +132,14 @@ export function ProfilePanel({
       if (autoLoadProfile === name) setAutoLoadProfile(null);
       setDeletingName(null);
       await fetchProfiles();
-    } catch (e: any) {
-      toast.error("Failed to delete: " + (e.message || String(e)));
+    } catch (e: unknown) {
+      toast.error("Failed to delete: " + errMsg(e));
     } finally {
       setIsDeleting(false);
     }
   }
 
-  async function handleRename(e: React.FormEvent, oldName: string) {
+  async function handleRename(e: React.SubmitEvent, oldName: string) {
     e.preventDefault();
     if (!renameValue.trim() || renameValue.trim() === oldName) {
       setRenamingName(null);
@@ -144,8 +153,8 @@ export function ProfilePanel({
       if (autoLoadProfile === oldName) setAutoLoadProfile(renameValue.trim());
       setRenamingName(null);
       await fetchProfiles();
-    } catch (e: any) {
-      toast.error("Failed to rename: " + (e.message || String(e)));
+    } catch (e: unknown) {
+      toast.error("Failed to rename: " + errMsg(e));
     } finally {
       setIsRenaming(false);
     }
@@ -179,7 +188,7 @@ export function ProfilePanel({
               value={newName}
               onChange={(e) => setNewName(e.target.value)}
               disabled={isSaving}
-              onKeyDown={(e) => e.key === "Escape" && setIsSaveOpen(false)}
+              onKeyDown={(e) => e.key === "Escape" && closeSaveForm()}
               className="flex-1 min-w-0 bg-zinc-950 border border-zinc-700 rounded px-3 py-1.5 text-sm focus:outline-none focus:border-pink-500 focus:ring-1 focus:ring-pink-500 disabled:opacity-50"
             />
             <button
@@ -191,7 +200,7 @@ export function ProfilePanel({
             </button>
             <button
               type="button"
-              onClick={() => setIsSaveOpen(false)}
+              onClick={closeSaveForm}
               className="px-3 py-1.5 text-zinc-400 hover:text-zinc-200 rounded text-sm transition shrink-0"
             >
               Cancel