修复: 协议层与体验缺陷六件

- temperature 按模型适配,仅收 1 的模型不再 400
- 流式 error 帧不再被 choices 必填整帧丢弃
- 只读缓存写后失效
- git diff 中文截断撞 UTF-8 边界 panic
- 非视觉模型纯图片直接拒绝
- 全局快捷键补输入焦点守卫

src/i18n/en/settings.ts

@@ -23,6 +23,7 @@ export default {
     // Out-of-range clamp notices (concurrency 1-64 + per-conv ≤ global; temperature reports the corrected value)
     toastConcurrencyClamped: 'Value out of range, corrected automatically (concurrency 1-{max}; per-conversation capped at global)',
     toastTempClamped: 'Sampling temperature must be within 0-2, corrected to {v}',
+    toastWeightClamped: 'Model weight must be within 0-100; out-of-range values corrected (cleared inputs default to 50)',
     // Prompt caching toggle save feedback (previously silent)
     toastAnthropicCacheSaved: 'Prompt caching setting saved',
     toastAnthropicCacheFail: 'Failed to save the prompt caching setting',
@@ -88,6 +89,7 @@ export default {
     saveModels: 'Save model config',
     modelListUnsavedHint: 'Model list has unsaved changes (enabled / weight) — closing or navigating away will discard them',
     toastFetchOk: 'Fetched {count} models',
+    toastFetchEmpty: 'Fetched 0 models — existing config kept',
     toastFetchFail: 'Fetch failed: {msg}',
     fetchFailedTimeout: 'Fetch timed out, check that the Base URL is reachable: {msg}',
     fetchFailedAuth: 'Authentication failed, check your API Key: {msg}',