fix(channels): replace stale channel query params

[baokimho]

What

Fix channel selection on /channels/create so switching channels does not carry stale query state into the next attempt.

Previously, the picker appended a new channel value to the entire existing query string. This could:

• carry a previous error into a new channel attempt
• create duplicate channel parameters

Fix

InboxSelectCard now updates the query through URLSearchParams:

• removes stale error
• replaces the existing channel
• preserves workspaceId
• preserves other valid query parameters

Tests

Added regression coverage for:

• preserving workspaceId
• removing stale error
• replacing an existing channel
• ensuring only one channel parameter exists
• selecting a channel with no existing query parameters
• preserving unrelated query parameters

git diff --check passes.

Focused Vitest execution could not complete locally because of Windows pnpm/environment issues, not a code-level test failure.

Fixes #1155

[Copilot]

🟢 Approval recommended

No unresolved issues block approval.

Pull request overview

Fixes stale query parameters when switching channels on /channels/create.

Changes:

• Replaces existing channel values safely.
• Removes stale error parameters while preserving valid query state.
• Adds regression tests for query handling.

File summaries

File	Summary
apps/builder/src/features/inboxes/components/inbox-select-card.tsx	Normalizes channel-selection query parameters.
apps/builder/__tests__/inbox-select-card.test.tsx	Adds regression coverage for query behavior.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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