Secured search logic to prevent runtime crashes on API errors

[Suraj704-glitch]

Secured search logic to prevent runtime crashes on API errors

Acceptance Criteria fulfillment

[x] Task 1: Wrapped the getSearchMessages API call in a try-catch block to ensure the app stays alive during server hiccups.

[x] Task 2: Implemented defensive rendering using Optional Chaining (?.) when reading message counts, preventing the TypeError crash.

[x] Task 3: Validated the fix in the sandbox environment by simulating high-traffic search bursts and verifying the UI doesn't break.
Fixes # (issue)

Video/Screenshots

PR Test Details

Note: The PR will be ready for live testing at https://rocketchat.github.io/EmbeddedChat/pulls/pr-<pr_number> after approval. Contributors are requested to replace <pr_number> with the actual PR number.

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