fix(vscode): remove model reset button

[marius-kilocode]

Problem

The chat prompt and New Worktree dialog exposed a model reset button that duplicated model selection and was not useful in the normal workflow.

Changes

• Remove the reset button from the chat prompt.
• Remove the reset button from the New Worktree dialog.
• Remove the dedicated session-context and webview message paths.
• Remove the reset tooltip translations and obsolete visual regression stories.
• Preserve model selection, per-agent model memory, and agent configuration through the existing selectors and settings.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (34 files)

• .changeset/remove-model-reset.md
• packages/kilo-docs/pages/code-with-ai/agents/model-selection.md
• packages/kilo-docs/public/img/screenshot-tests/kilo-vscode/visual-regression/prompt-input/with-model-override-200-chromium-linux.png
• packages/kilo-docs/public/img/screenshot-tests/kilo-vscode/visual-regression/prompt-input/with-model-override-420-chromium-linux.png
• packages/kilo-vscode/src/kilo-provider/model-state.ts
• packages/kilo-vscode/tests/unit/session-model-store.test.ts
• packages/kilo-vscode/webview-ui/agent-manager/NewWorktreeDialog.tsx
• packages/kilo-vscode/webview-ui/src/components/chat/PromptInput.tsx
• packages/kilo-vscode/webview-ui/src/context/session.tsx
• packages/kilo-vscode/webview-ui/src/i18n/ar.ts
• packages/kilo-vscode/webview-ui/src/i18n/br.ts
• packages/kilo-vscode/webview-ui/src/i18n/bs.ts
• packages/kilo-vscode/webview-ui/src/i18n/da.ts
• packages/kilo-vscode/webview-ui/src/i18n/de.ts
• packages/kilo-vscode/webview-ui/src/i18n/en.ts
• packages/kilo-vscode/webview-ui/src/i18n/es.ts
• packages/kilo-vscode/webview-ui/src/i18n/fa.ts
• packages/kilo-vscode/webview-ui/src/i18n/fr.ts
• packages/kilo-vscode/webview-ui/src/i18n/it.ts
• packages/kilo-vscode/webview-ui/src/i18n/ja.ts
• packages/kilo-vscode/webview-ui/src/i18n/ko.ts
• packages/kilo-vscode/webview-ui/src/i18n/nl.ts
• packages/kilo-vscode/webview-ui/src/i18n/no.ts
• packages/kilo-vscode/webview-ui/src/i18n/pl.ts
• packages/kilo-vscode/webview-ui/src/i18n/ru.ts
• packages/kilo-vscode/webview-ui/src/i18n/th.ts
• packages/kilo-vscode/webview-ui/src/i18n/tr.ts
• packages/kilo-vscode/webview-ui/src/i18n/uk.ts
• packages/kilo-vscode/webview-ui/src/i18n/zh.ts
• packages/kilo-vscode/webview-ui/src/i18n/zht.ts
• packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx
• packages/kilo-vscode/webview-ui/src/stories/history.stories.tsx
• packages/kilo-vscode/webview-ui/src/stories/prompt-input.stories.tsx
• packages/kilo-vscode/webview-ui/src/types/messages/webview-messages.ts

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_{Reviewed by grok-4.6 · Input: 188.3K · Output: 9.8K · Cached: 352.4K}

_{Review guidance: REVIEW.md from base branch main}