Add sort dropdown to session list

[Mr-Godot]

Context

Sessions are always sorted by recency with pinned items boosted. Users want control over sort order.

Action

1. Add sort param to route search schema: z.enum(['latest', 'mostActive', 'longest', 'mostTokens', 'starred']).default('latest')
2. Add sort dropdown to SessionFilters (Row 1 alongside search)
3. Update paginatedSessionsInputSchema in sessions.api.ts to accept sort
4. Implement server-side sort logic in paginateAndFilterSessions:
   • latest: lastActiveAt DESC (default, with pin boost)
   • mostActive: messageCount DESC, then lastActiveAt DESC
   • longest: durationMs DESC, then lastActiveAt DESC
   • mostTokens: needs token data — may need to add to SessionSummary or approximate from fileSizeBytes
   • starred: filter to pinned only, then by lastActiveAt DESC
5. Update sessions.queries.ts to pass sort param

Note on "mostTokens"

SessionSummary currently has no token count field. Options:

• Use fileSizeBytes as proxy (larger files = more tokens)
• Add totalTokens to SessionSummary by reading stats-cache
• Parse token usage from JSONL during summary scan

Acceptance Criteria

• Sort dropdown visible next to search
• All 5 sort options work correctly
• URL reflects sort choice (?sort=mostActive)
• Page resets to 1 when sort changes
• Default: "Latest"

[github-actions]

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