Fix Mailbox

[cooper-grc]

Summary by cubic

Fixes mailbox so it handles missing email integrations gracefully and still shows threads. Row Detail now falls back to synthetic threads when no connection is configured.

• Bug Fixes
  • EmailThreadFetcher returns nil credentials (and logs) when GetConnection returns nil, avoiding errors when email isn’t configured.
  • Row Detail returns synthetic email threads from task outputs if connection lookup returns nil (e.g., shows gmail:thread-123 with correct thread_id).
  • Thread fetching tries both Gmail and Outlook for unqualified refs, skips missing providers, and correctly marks outbound messages.

^{Written for commit 5842565. Summary will update on new commits.}

[github-actions]

✅ Integration Tests PASSED

Gateway: https://api.airstore.ai
Query path: /sources/gmail/unread-emails
Timestamp: 2026-04-17T19:36:08Z

I/O Smoke Tests

Test	Status	Latency	Bytes
list_sources	PASS	235ms	-
list_gmail	PASS	378ms	-
list_query_path	PASS	588ms	-
read_file	PASS	515ms	3,238
stat_file	PASS	237ms	30,498

Compression A/B Tests

Metric	Value
Files tested	9
Total raw bytes	76,271
Total strip bytes	49,358
Total raw tokens	42,790
Total strip tokens	28,493
Tokens saved	14,297
Byte reduction	35%
Token reduction	33%
Min threshold	10%
Cache consistent	Yes

Per-file results

File	Raw B	Strip B	Raw Tok	Strip Tok	Tok Saved	Red%	Raw ms	Strip ms
2024-10-15_Harris-Walz_Organizing_Tea...	2,337	2,305	976	967	9	1%	348ms	235ms
2024-10-15_Stephen_King_via_KamalaHar...	2,904	2,866	1,116	1,103	13	1%	365ms	243ms
2025-07-17_KAYAK_How_to_have_everythi...	1,724	1,670	1,220	1,204	16	3%	405ms	245ms
2025-07-17_Alamo_Drafthouse_Cinema_Th...	19,047	18,224	12,228	11,704	524	4%	439ms	299ms
2025-07-17_Alamo_Drafthouse_Cinema_Th...	18,978	18,155	12,105	11,578	527	4%	442ms	311ms
2026-04-17_Charlie_Anderson_The_real_...	3,238	3,028	1,061	963	98	6%	233ms	245ms
2024-10-15_Knut_at_Sanity_Join_us_tom...	1,272	726	504	209	295	42%	362ms	237ms
2025-07-17_Lindsay_Stanley_TODAY_Conf...	1,876	1,049	657	268	389	44%	346ms	244ms
2025-07-17_NORDSTROM_RACK_FLASH_Travi...	24,895	1,335	12,923	497	12,426	94%	403ms	259ms

Charts

Overall Compression	Raw vs Compressed Bytes	Token Comparison
Reduction by File	Read Latency	I/O Latency

[cubic-dev-ai]

No issues found across 3 files