fix(extension): clear the 170 eslint-plugin-svelte v3 warnings

[devin-ai-integration]

Summary

• pnpm lint reported 170 warnings in @pulse/extension (0 elsewhere). All are cleared and the rules that were temporarily downgraded to warn for the v3 bump are back to their recommended error level, so regressions now fail CI.
• require-each-key (73) — every {#each} gets a key. Keys are identity/id-based where items are stable ((mission.id), (tab.id), (connectorId)), and index-based where values may legitimately repeat or are placeholders (scraped mission.stack chips, Array(3) skeletons) to avoid duplicate-key runtime errors.
• no-useless-children-snippet (9) — <Button>{#snippet children()}X{/snippet}</Button> → <Button>X</Button>.
• prefer-writable-derived (1) — ApplicationsPage:

  -let nextActionInput = $state('');
  -$effect(() => { nextActionInput = isoToDateTimeLocal(selectedTracking?.nextActionAt ?? null); });
  +let nextActionInput = $derived(isoToDateTimeLocal(selectedTracking?.nextActionAt ?? null));

• prefer-svelte-reactivity (84) — turned off rather than migrated: every flagged site is either a non-reactive helper collection (toast timers, profile listeners, local Maps inside $derived.by) or a copy-on-write Map/Set reassigned into $state (trackings = new Map(trackings).set(...)), which is already reactive. SvelteMap/SvelteSet would only add proxy overhead.
• no-navigation-without-resolve (3) — turned off: SvelteKit-only rule, and the extension links to external platform URLs with no router to resolve against.

Verification

• pnpm format:check
• pnpm lint
• pnpm typecheck
• pnpm test (2009 extension tests + all packages)
• pnpm build

Checklist

• No secrets, cookies, session tokens, or generated release artifacts committed
• Core code remains pure; I/O stays in shell modules
• Svelte changes use Svelte 5 runes only
• Documentation updated when behavior or setup changes (n/a)

Link to Devin session: https://app.devin.ai/sessions/09e605ad12cc4cd7a0f44a2e05e564ae
Requested by: @guyghost

[devin-ai-integration]

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Project	Deployment	Actions	Updated (UTC)
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