Simplify UI jargon: Post-Processing, Verify Task Completion, Max Iterations, Message Queuing

[aj47]

UI Jargon Simplification — Batch

Four settings labels that use technical jargon and could be friendlier for non-technical users:

1. "Post-Processing" → "Auto-Cleanup"

• File: src/renderer/src/pages/settings-general.tsx:853
• Why: "Post-Processing" sounds like video editing software. "Auto-Cleanup" immediately communicates what it does — tidies up transcripts automatically.

2. "Verify Task Completion" → "Double-Check Work"

• File: src/renderer/src/pages/settings-general.tsx:266
• Why: "Verify Task Completion" is robotic. "Double-Check Work" is how a human would describe it.

3. "Max Iterations" → "Max Steps"

• File: src/renderer/src/pages/settings-general.tsx:288
• Why: "Iterations" is developer jargon. "Steps" is universally understood and conveys the same meaning.

4. "Message Queuing" → "Queue Messages"

• File: src/renderer/src/pages/settings-general.tsx:253
• Why: "Queuing" is CS terminology. "Queue Messages" as a verb phrase is slightly clearer, or could also become "Stack Messages" / "Buffer Messages" — but even just making it an action phrase helps.

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Related to #1111 and #1112 (jargon simplification effort).