fix(submissions): improve link validation UX, banner display, and err…

[Benjtalkshow]

…or toasts (#547)

• Reconcile frontend link types with backend enum (github, demo, video, document, presentation, other)
• Allow up to 5 "other" links per submission with smart type-picking on Add Link and duplicate guards on type change
• Add 500-character cap and live counter on the optional Introduction field
• Pass banner through initialData on submission edit so the saved banner displays
• Add banner field to ParticipantSubmission so the type compiles
• Set mock-fill participation type from myTeam to avoid INDIVIDUAL submissions while on a team
• Switch submission error toasts to title + description with 8s duration so backend messages are readable
• Update SubmissionLinksTab icon mapping for the new link types

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Project	Deployment	Actions	Updated (UTC)
boundless-kd16	Building	Preview, Comment	May 14, 2026 4:17pm

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