Fix navigation menu, hide unsupported settings tabs, and restore config backgrounds

[SWangHash]

… backgrounds

Nav panel footer menu:

• Fix duplicate "关于" button: the feedback button was mislabeled as t('header.about') instead of t('header.feedback'); switch its icon to MessageSquare to distinguish from the About button.
• Remove the hidden Floating Mode button and its extra divider that caused two separator lines between Remote Control and Insights.

Settings tabs hidden (OHOS unsupported):

• Hide session-personalization, external-sources, and voice-input tabs from the config center (ConfigTab type, categories, content loaders, scene switch, search content). Redirect legacy deep-links and external callers to the closest available tab.
• In SessionPermissionsConfig, disable Computer Use, Browser Control (CDP), and Debug Mode sections via {false && (...)} wrappers.

Config box backgrounds:

• Remove the .bitfun-config-page-section__body override (background: transparent; border: 0) from McpToolsConfig.scss and ExternalSourcesConfig.scss so the default ConfigPageLayout box background and border are visible, matching other config pages.

Summary

Fixes #

Type and Areas

Type:

Areas:

Motivation / Impact

Verification

Reviewer Notes

Checklist

• This PR is focused and does not include secrets, temporary prompts, generated scratch files, or unrelated artifacts.
• Relevant verification is recorded above, or skipped checks are explained.
• User-facing strings, docs, and locales are updated where applicable.