fix: rescan (r) now performs fresh scan instead of returning cached data

[curtis2point1]

Summary

• Fix rescan shortcut (r) to bypass cache and fetch fresh git status
• Previously, rescan returned cached data if cache was < 5 minutes old, making it ineffective

Problem

When pressing r to rescan, the app calls scanReposCmd() which checks cache first. If the cache is valid (< 5 min) and roots haven't changed, it returns stale data. Users had to quit and restart the app to see updated dirty/clean status.

Solution

Added forceRefresh bool parameter to scanReposCmd():

• r (rescan) and workspace switch now pass true to bypass cache
• Initial load still passes false to benefit from fast cached startup

Test plan

• Run git-scope, note a repo's status
• In another terminal, make a change in that repo (e.g., touch newfile)
• Press r to rescan — status should update immediately
• Restart app — should still load quickly from cache on startup

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