Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@app/chat/page.tsx`:
- Around line 13-16: The code currently asserts searchParams values as strings
which breaks if params are arrays; normalize values first by checking
Array.isArray on params?.q and params?.email and extracting the first element
(or undefined) before calling getMessages or using email, e.g., compute a
safeInitialMessage and safeEmail from params and pass safeInitialMessage to
getMessages so downstream code only ever receives string | undefined rather than
string | string[].

In `@app/page.tsx`:
- Around line 13-16: The code assumes searchParams keys are strings but may be
arrays; update how params is read so initialMessage and email handle array
values safely: when retrieving params (the const params, usage of initialMessage
and email) coerce params?.q and params?.email to strings by checking if they are
arrays (e.g., Array.isArray) and picking the first element or joining as needed,
then pass that sanitized string into getMessages(initialMessage) and any
downstream logic; ensure getMessages is called only with a string and email is
typed as string | undefined after normalization.

---

Nitpick comments:
In `@app/page.tsx`:
- Around line 11-18: The param parsing in Home (function Home in app/page.tsx)
duplicates logic used in app/chat/page.tsx; extract this into a shared utility
(e.g., parseSearchParams) that accepts the searchParams object and returns {
initialMessage, email } using a helper to normalize string|string[] values, then
update Home to call parseSearchParams(await searchParams) and pass the returned
initialMessage into getMessages and email into HomePage; ensure generateUUID()
and getMessages(...) usage remains unchanged and only the params extraction is
moved to the new utility.

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="hooks/useVercelChat.ts">

<violation number="1" location="hooks/useVercelChat.ts:174">
P2: `accountIdOverride` in the request body will be ignored for authenticated users because the server always overwrites `accountId` with the header-derived value. The override feature won’t take effect unless the backend accepts an explicit override field or conditional logic.</violation>
</file>

<file name="hooks/useEmailAccountId.ts">

<violation number="1" location="hooks/useEmailAccountId.ts:18">
P2: Reset the accountId when `email` is missing or changes; otherwise the hook can return a stale accountId from a prior email.</violation>

<violation number="2" location="hooks/useEmailAccountId.ts:36">
P2: Effect lacks cancellation or latest-email check, so slower responses can overwrite accountId with stale data after email changes.</violation>
</file>

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="lib/accounts/fetchAccountIdByEmail.ts">

<violation number="1" location="lib/accounts/fetchAccountIdByEmail.ts:20">
P1: Only treat 404 as “not found”; other HTTP errors should be surfaced instead of being silently converted to null.</violation>
</file>