Fix partial chat display: path encoding, reconnect safety, and JSONL parsing

[mcintyre94]

Summary

• Root cause found: Claude Code encodes project directories by replacing both / and . with -, but Wisp only replaced /. Worktree chats (under .wisp/) had their JSONL paths computed as -home-sprite-.wisp-... instead of the actual -home-sprite--wisp-..., so loadRemoteHistory silently found nothing and fell back to whatever partial state was in SwiftData — producing the "chat starts at 'Now let me do a quick sanity check...'" symptom.
• Secondary fix: auto-load the JSONL from disk when local messages are empty but a sessionId is known, so the full chat is always recoverable even after a SwiftData loss.
• Reconnect hardening: two sub-fixes so partial/truncated service logs can't silently overwrite good content, and retry iterations without UUID tracking don't duplicate events.
• JSONL parsing: block-format user messages (some Claude Code versions write [{type:text}] arrays instead of plain strings) were being silently dropped.

Changes

claudeProjectPathEncoding helper (ChatViewModel.swift)

• Replaces both / and . with -, matching Claude Code's actual on-disk encoding
• Extracted into a named nonisolated static helper used by both fetchRemoteSessions and loadRemoteHistory

reconnectIfNeeded

• When messages.isEmpty but sessionId != nil, fires loadRemoteHistory to recover the full conversation from the JSONL file on the sprite
• Guarded by !isLoadingHistory to prevent concurrent duplicate calls (dashboard, detail view, and background resume all call this)

runReconnectLoop

• Snapshots existing assistant content before replay; restores it if the replay ends without a system event (truncated logs) or produces fewer items than the snapshot
• Resets replay buffering state on retry iterations when UUID tracking is absent, preventing content from being doubled on each pass

parseSessionJSONL

• User events with [{type:\"text\", text:\"...\"}] block arrays are now treated as user messages (same as the plain-string case), not silently discarded

Test plan

• Run unit tests: xcodebuild -scheme Wisp -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 17' test
• Open a worktree chat that previously showed partial content — should now load the full conversation from the JSONL
• Open a chat where SwiftData was cleared (delete app data) — should recover history via loadRemoteHistory
• Verify new claudeProjectPathEncoding tests pass (3 cases: standard path, worktree path with .wisp, repo path)
• Verify new reconnect loop tests pass (truncated logs restore snapshot, no duplication on retry)
• Verify new parseSessionJSONL tests pass (block-format user messages, multi-turn, tool-result disambiguation)

🤖 Generated with Claude Code