fix(chat): restore user prompts in session message history

[dimakis]

Summary

• User prompts were completely missing from restored session histories. The SDK stores user messages with content as a plain string, while assistant messages use an array of content blocks. The getMessages API had if (!Array.isArray(content)) continue; which skipped every user prompt.
• Now handles both formats: plain strings (user prompts) and content block arrays (assistant turns, tool results).

Root Cause

// Before — skips all user prompts
if (!Array.isArray(content)) continue;

// After — handles string content for user messages
if (typeof content === 'string') { /* build text block */ }
else if (Array.isArray(content)) { /* existing logic */ }

Test plan

• Open any previous session — verify user prompts now appear
• Check a session with image attachments — user message text should show
• Check a multi-turn session — all user messages present between assistant turns
• Verify tool result messages (SDK-injected user type with only tool_result blocks) are still filtered out

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