fix(flow-chat): improve permission request previews

[wsp1911]

Summary

• Add a shared CopyableTextPreview for interactive, multiline text tooltips with a copy action.
• Reuse it for command and permission-resource previews, using the BitFun theme font and a wider tooltip.
• Show batch permission actions for a single pending request, and prevent allow actions when rejection feedback is present.
• Refine permission-panel visual states, including the collapse button and disabled-button cursors.
• Move the text-copy hook into the shared FlowChat hooks directory and update all command-preview consumers.

Fixes #

Type and Areas

Type:

UI/UX, bug fix, refactor

Areas:

Web UI, FlowChat permission requests, tool cards

Motivation / Impact

Permission resource and interactive command previews are now readable, hoverable, and copyable even for multiline content. Permission actions are more consistent for one or many requests, and rejection feedback no longer permits contradictory allow actions.

Verification

• pnpm --dir src/web-ui run test:run src/flow_chat/components/modern/PermissionRequestPanel.test.tsx — passed (10 tests)
• pnpm --dir src/web-ui run test:run src/flow_chat/components/CopyableTextPreview.test.tsx — passed (1 test)
• pnpm run type-check:web — passed
• pnpm run i18n:audit — passed with 0 warnings
• git diff --cached --check — passed

Reviewer Notes

• Manual desktop/browser verification was not run. Please verify tooltip pointer transition, copy feedback, and the disabled cursor in the permission panel.

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.