fix(cache): show details for verbose size

[OnlyYu1996]

Fixes PlatformNetwork/bounty-challenge#53106.

Changes:

• Passes the global --verbose flag into the cache command handler.
• Keeps default cortex cache size output as the single human-readable size line.
• Adds verbose cache size details: cache directory, existence, total item count, and per-category size/item/path rows.
• Returns full cache stats for cortex --verbose cache size --json, while preserving the existing compact JSON shape for non-verbose JSON.
• Adds regression tests for verbose text and verbose JSON details.
• Fixes a stale test import so the cortex-cli test target builds on current main.

Validation:

• cargo +stable fmt --package cortex-cli --check
• cargo +stable test --package cortex-cli cache_cmd::tests::test_cache_size_verbose -- --nocapture
• cargo +stable check --package cortex-cli --lib
• cargo +stable build --package cortex-cli --bin Cortex
• Smoke: target/debug/Cortex.exe cache size --color never vs target/debug/Cortex.exe --verbose cache size --color never are no longer identical; verbose output includes cache directory and categories.
• git diff --check

[greptile-apps]

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