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/cli/src/extension.ts

@@ -1,5 +1,5 @@
 import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
-import { Type } from "typebox";
+import { Type, type TSchema } from "typebox";
 import { StringEnum } from "@mariozechner/pi-ai";
 import {
   TaskStore,
@@ -298,7 +298,7 @@ export default function kbExtension(pi: ExtensionAPI) {
       column: Type.Optional(
         StringEnum([...COLUMNS] as unknown as string[], {
           description: "Filter to a specific column",
-        }) as any,
+        }) as unknown as TSchema,
       ),
       limit: Type.Optional(
         Type.Number({
@@ -1039,10 +1039,10 @@ export default function kbExtension(pi: ExtensionAPI) {
       let taskId: string | undefined;
       try {
         taskId = await runTaskPlan(params.description, true); // Use --yes flag for non-interactive
-      } catch (err: any) {
+      } catch (err) {
         console.error = originalError;
         console.log = originalLog;
-        throw new Error(`Planning mode failed: ${err.message}`);
+        throw new Error(`Planning mode failed: ${err instanceof Error ? err.message : String(err)}`);
       } finally {
         console.error = originalError;
         console.log = originalLog;