refactor(web): consolidate localStorage access and split appearance/notification modules

[wbxl2000]

Related Issue

N/A — internal refactor with no user-facing behavior change.

Problem

• apps/kimi-web/src/composables/useKimiWebClient.ts had grown to ~4500 lines, acting as a god composable that mixed global state, API wrapping, localStorage persistence, theme/notification management, and more.
• localStorage reads/writes were scattered across 8+ files, each with duplicated try/catch and ad-hoc key constants.
• There was no centralized storage helper, making future refactors error-prone.

What changed

• Added apps/kimi-web/src/lib/storage.ts with safe get/set/remove/JSON helpers and centralized key constants. Existing key names are preserved unchanged (including the legacy kimi-active-workspace naming).
• Migrated all localStorage usage in useKimiWebClient.ts, App.vue, Composer.vue, ConversationPane.vue, OpenInMenu.vue, useResizable.ts, i18n/index.ts, api/config.ts, and debug/trace.ts to use storage.ts.
• Added apps/kimi-web/test/storage-logic.test.ts with 13 pure-logic test cases (no jsdom).
• Extracted composables/client/useAppearance.ts and composables/client/useNotification.ts from useKimiWebClient.ts.
• Reshaped maybeNotifyCompletion so useNotification does not read rawState; useWorkspaceState will pass in pre-computed context (isActiveAndVisible, sessionTitle, onClick) in future PRs.
• Kept useKimiWebClient() as a facade: its return shape, fields, and type exports (Theme, ColorScheme, Accent) are unchanged; no component or call site was modified.

Verification

• pnpm --filter @moonshot-ai/kimi-web typecheck ✅
• pnpm --filter @moonshot-ai/kimi-web test ✅ (22 tests passed)
• pnpm --filter @moonshot-ai/kimi-web build ✅
• useKimiWebClient.ts: 4529 → 4233 lines.

Checklist

• I have read the CONTRIBUTING document.
• I have explained the problem above (no related issue for this internal refactor).
• I have added tests that prove the storage helpers work.
• Ran gen-changesets skill.
• This PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 38861e0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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[pkg-pr-new]

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commit: 38861e0