Linear: paste only URL as draft on workspace create

[nwparker]

Problem

Creating a workspace via 'create from' with a GitHub issue/PR pastes just the URL into the agent's input as a draft (no auto-submit). But Linear pastes a full details block (ID, title, status, team, assignee, labels, URL, description) and auto-submits it.

Fix

handleSmartLinearIssueSelect (src/renderer/src/hooks/useComposerState.ts) was auto-filling the composer's note field with the multi-line details block. At launch, because Linear items use number === 0, the composer's isLinearTypedOnly branch fired and sent that note to the agent as a prompt — which submits.

Stop auto-filling the note. With an empty note, Linear falls into the same launch branch GitHub uses:

const quickDraftPrompt = linkedWorkItem && !isLinearTypedOnly ? linkedWorkItem.url : null

…which types only the URL into the agent's input as a draft (no Enter). Workspace name still auto-fills with the issue title (separate field, untouched).

Test plan

• Open new-workspace composer, pick a Linear issue → name field auto-fills with title; agent input gets only the issue URL as a draft (no submit).
• Pick a GitHub issue/PR → unchanged (URL drafted, no submit).
• Manually typing a note before submit still works (and for hand-typed Linear identifiers without a URL, the existing typed-only fallback still sends the note).

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