Unify ISO8601 date parsing across ClaudeConversationIndex and TranscriptParser

[2witstudios]

Context

Two files create their own ISO8601DateFormatter instances and parseTimestamp functions:

ClaudeConversationIndex.swift (lines 76-86, 385-389)

• Two formatters: one with fractional seconds, one without
• parseTimestamp returns Date? — tries fractional first, then plain, returns nil on failure

TranscriptParser.swift (lines 175-184)

• One formatter: fractional seconds only
• parseTimestamp returns Date — falls back to Date() on failure (masks parse errors)

Differences

The two implementations have subtly different semantics:

• ClaudeConversationIndex handles timestamps both with and without fractional seconds
• TranscriptParser only handles fractional seconds — timestamps without them silently return Date() (current time)

Proposal

Create a shared DateParsing utility (or extend the existing ShellUtilities.swift) with:

enum DateParsing {
    static func parseISO8601(_ value: String?) -> Date? { ... }
}

Both callers adopt the shared version, with TranscriptParser using ?? Date() at the call site if it needs that fallback.

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