cleanup typescript

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+# Changelog — 2026-03-28 #01
+
+## Strict TypeScript Convention Compliance
+
+### `tsconfig.json`
+- Added `strict: true` (umbrella flag covering `noImplicitAny`, `noImplicitThis`, `strictNullChecks`, `strictBindCallApply`, `strictFunctionTypes`, `strictPropertyInitialization`, `useUnknownInCatchVariables`, `alwaysStrict`).
+- Added `exactOptionalPropertyTypes: true`.
+- Added `noFallthroughCasesInSwitch: true`.
+- Added `noPropertyAccessFromIndexSignature: true`.
+- Added `forceConsistentCasingInFileNames: true`.
+- Removed redundant individual flags superseded by `strict: true`.
+
+### `src/main.ts`
+- Changed `AIPulseSettings` to `import type` (type-only import).
+
+### `src/ollama-client.ts`
+- Replaced explicit `undefined` assignments on optional properties with conditional spread in `parseToolCalls()`.
+- Replaced intermediate boolean guards with direct `!== undefined` narrowing in `chatAgentLoop()`.
+
+### `src/chat-view.ts`
+- Replaced `condition ? value : undefined` patterns with conditional spreads for `exactOptionalPropertyTypes` compliance in `handleSend()`.
+- Removed 6 redundant `as HTMLDivElement` type assertions (already narrowed by null checks).