Adds support for comma-separated patterns and negative filters (using ! prefix) in the Output panel filter.

Changes

Filter parsing (parseFilters)

• Splits input by comma to extract multiple patterns
• Identifies negative filters by ! prefix
• Trims whitespace and filters empty patterns

Filter application (shouldShowLine)

• Negative filters checked first (early exit if match)
• Positive filters use OR logic (any match shows line)
• No positive filters defaults to showing everything

UI update

• Placeholder now shows: "Filter (e.g. text, !exclude, error,warning)"

Examples

// Multiple patterns - shows lines matching ANY pattern
"error,warning,critical"

// Negative filters - hides matching lines
"!debug,!trace,!copilot"

// Combined - shows errors/warnings but excludes copilot logs
"error,warning,!copilot"

Single filters work unchanged: "error" behaves identically to before.

Testing

Added unit tests covering:

• Single/multiple positive and negative filters
• Mixed positive and negative patterns
• Whitespace handling and edge cases

• Fixes Output filter- support negative and multiple filters #238696

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