Add permission scope toggle (this project / all projects)

[magiak]

Summary

• Adds a toggleable scope selector to the "always allow" permission button, matching the native Claude Code CLI behavior
• When the CLI provides permission_suggestions with scope info, users can click underlined text to switch between "this project (just you)" and "all projects"
• Suggestions are filtered by destination field (projectSettings/localSettings vs userSettings) before being sent back to the CLI
• Button labels updated to match native CLI: "No" / "Yes" instead of "Deny" / "Allow"

Changes

• src/extension.ts — Compute hasProjectScope/hasUserScope from suggestions, accept scope from UI, filter suggestions by destination before sending control_response
• src/script.ts — Scope toggle UI with togglePermissionScope(), updated respondToPermission() to include scope, decision text shows selected scope
• src/ui-styles.ts — .scope-toggle and .scope-suffix styles, adjusted .always-allow button for text wrapping

Test plan

• Trigger a Bash permission request — verify scope toggle appears if CLI sends scope-bearing suggestions
• Click the underlined "this project" text — verify it toggles to "all projects" without submitting
• Click the button — verify it submits with the correct scope and updates .claude/settings.json or ~/.claude/settings.json
• Trigger a non-Bash permission (e.g., ExitPlanMode) — verify fallback behavior when CLI sends no suggestions
• Verify "No" and "Yes" buttons still work correctly