fix(bounty): settings polish — full-width tabs, editable timeline, drop back link

[Benjtalkshow]

What

Settings-page polish on the bounty organizer settings (follow-up to #678):

• Full-width tabs — removed the max-w-2xl caps on the tab content and let the page container span full width, so content extends to the edge instead of a narrow column.
• Removed the "Back to dashboard" link — the hackathon organizer settings has none (the sidebar handles nav), dropped for parity.
• Editable application window in the Timeline tab — the one timeline field that is off-chain (applicationWindowCloseAt, enforced by a backend cron) is now editable there, with a Save that PATCHes the off-chain endpoint. The submission deadline stays read-only with an "On-chain" badge (anchored in the escrow at publish). Moved the application-window field out of the General tab so it lives with the timeline it belongs to.

On-chain vs off-chain (Timeline)

• Submission deadline → on-chain (create_event arg) → read-only.
• Application window close → off-chain (cron-enforced) → editable.

Verification

• tsc --noEmit — 0 errors.
• eslint . — clean.

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