perf(web)+ci: fix preview queue, ai stream abort, deploy

[Swastikdan]

Includes:

• perf(web): restore instant nav (80ms bar, preload 100ms), LCP priority fix, LQ w342/w300, preload LCP, lazy below-fold, UserSync lazy, logo cache 7d
• ci(preview): cancel stale queue (v2, merge_group, per-event group) – fixes Add advanced options toggle, responsive layout tweaks, and search input style updates #36 52m queue and feat: implement architecture deepening #49 cancel
• ci(deploy): handle merge_group + pusher check (fixes prod not deploying after 727e3d7)
• fix(ai): handle aborted signal and timeout cleanup (isAbortError, clearTimeout)
• feat(admin): bypass AI rate-limit for admins

[coderabbitai]

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