Disable no-op strategy switch actions

[Pigbibi]

Summary

• hide pending reserved-cash and strategy rows unless they differ from readable current state
• disable the switch button when there are no pending changes
• keep the button enabled when strategy, mode, or reserved-cash settings actually change

Tests

• node --experimental-default-type=module tests/strategy_switch_worker_validation.mjs
• python3 -m pytest tests/test_runtime_settings.py -q
• node --check --input-type=module < web/strategy-switch-console/worker.js
• node --check --input-type=module < web/strategy-switch-console/page_asset.js
• node --check --input-type=module < web/strategy-switch-console/strategy_profiles_asset.js
• sed -n '/<script>/,/</script>/p' web/strategy-switch-console/index.html | sed '1d;' | node --check --input-type=commonjs
• jq empty web/strategy-switch-console/account-options.example.json web/strategy-switch-console/strategy-profiles.example.json
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Allow mode-only switches when current mode is unread

When /api/config can read the current strategy but not an execution mode (for example the legacy STRATEGY_PROFILE fallback in worker.js returns strategy_profile without execution_mode for non-paper targets), currentMode is an empty string. In that state selecting Paper with the same strategy is a real mode change, but this condition keeps modeChanged false, so hasPendingChanges() disables the dispatch button unless the user also changes strategy or cash settings.

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