fix: make tsc --noEmit pass cleanly

[ruanbarroso]

Problem

npm run type-check (tsc --noEmit) was failing even though next build succeeds. The build masks type errors because next.config sets typescript.ignoreBuildErrors: true, so tsc is the only thing that actually type-checks the project — and it was reporting 39 errors.

The originally-reported errors came from src/components/KeysBrowser.backup.tsx (malformed JSX), an orphaned file that isn't imported anywhere. But removing it revealed the rest of the project never type-checked cleanly either.

Changes

Orphaned stale files removed (unreferenced — confirmed via grep, outside the build dependency graph):

• src/components/KeysBrowser.backup.tsx — malformed JSX (the 4 originally-reported errors)
• src/components/Dashboard.old.tsx — referenced RedisStats fields that no longer exist

src/types/redis.ts:

• Added 'none' to RedisDataType — Redis TYPE returns none for missing keys, and the code already shoehorned it in via casts
• Added instantaneousInputKbps / instantaneousOutputKbps (real Redis INFO fields, parsed in the metrics route)
• Allowed clientRttP50 / clientRttP95 to be number | null to match their producers and consumers

API routes:

• command: destructure command name so redis.call() gets a tuple, not a spread
• config / slowlog: type the unknown results of ioredis config() / slowlog()
• monitor: annotate the monitor() callback params (no-implicit-any)
• keys: explicit array type to break circular type inference
• metrics: coalesce nullable connectionId to undefined

Components:

• TreeView: fix @/store/store → @/store import path
• KeysBrowser: pass undefined for a null selectedKey; drop an impossible phase === 'cancelled' check (that phase never exists)
• Monitor: type the fractionalSecondDigits option (absent from the ES2017 lib types); drop invalid Chip size="large"
• KeysBrowser / TreeView: add none to the getTypeColor lookup maps

src/services/metrics.ts: guard possibly-undefined CPU stat fields.

Verification

npm run type-check now exits 0 with no errors. Changes are type-level or behavior-preserving (the dropped Chip size="large" was invalid and visuals come from sx; the dropped cancelled check was always-true dead code).

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