refactor: eliminate ~400 no-explicit-any warnings across the workspace

Parallel subagent pass: four typescript-pro agents on non-overlapping scopes.

Patterns applied:
- catch (err: any) { ... err.message ... } → catch (err) { ... getErrorMessage(err) ... }
  using the new @fusion/core helper. Bare catch {} where the error was unused.
- SQLite row types: defined typed XxxRow interfaces per table and cast
  .all()/.get() results via `as unknown as XxxRow[]` (the double cast is
  required because better-sqlite3 returns Record<string, SQLOutputValue>).
- rowToX(row: any) converters: typed argument with the matching row interface.
- Dynamic settings key writes: (settings as Record<string, unknown>)[key].
- React event handlers and setState callbacks: inferred types or concrete
  React.{Mouse,Change,Form}Event<...> where needed.
- pi-claude-cli: local PiMessage / PiContext duck types to avoid re-typing
  pi-ai concrete shapes; typed Claude stream event message fields.

72 files changed, ~400 anys eliminated. Typecheck passes across the workspace.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/dashboard/app/hooks/useFileEditor.ts

@@ -1,4 +1,5 @@
 import { useState, useEffect, useCallback } from "react";
+import { getErrorMessage } from "@fusion/core";
 import type { FileContentResponse, SaveFileResponse } from "../api";
 import { fetchFileContent, saveFileContent } from "../api";
 
@@ -65,9 +66,9 @@ export function useFileEditor(
           setOriginalContent(response.content);
           setMtime(response.mtime);
         }
-      } catch (err: any) {
+      } catch (err) {
         if (!cancelled) {
-          setError(err.message || "Failed to load file");
+          setError(getErrorMessage(err) || "Failed to load file");
           setContentState("");
           setOriginalContent("");
           setMtime(null);
@@ -100,8 +101,8 @@ export function useFileEditor(
       const response: SaveFileResponse = await saveFileContent(taskId, filePath, content, projectId);
       setOriginalContent(content);
       setMtime(response.mtime);
-    } catch (err: any) {
-      setError(err.message || "Failed to save file");
+    } catch (err) {
+      setError(getErrorMessage(err) || "Failed to save file");
       throw err;
     } finally {
       setSaving(false);