Developer unlock via in-page modal (works in installed iOS app)

[CarlosA49]

Summary

Makes the developer no-limit mode work in the installed iOS app version (Add to Home Screen / standalone PWA), where native prompt()/alert() are blocked.

• Dev unlock now uses an in-page modal (#devModal) like the other panels: password field + Unlock, inline error message, and an "ON" state with a Turn-off button
• All triggers open the same modal: 7-tap on the title, #dev URL, __dev() console, and the Owner tools → Developer toggle
• No reliance on native dialogs anywhere in the dev flow → works in Safari, desktop, and the installed iOS/iPadOS app
• Owner-panel toggle label stays in sync via setDevMode; devModal added to outside-click close handling; sw cache → v6

Test plan

• Add site to Home Screen on iPhone/iPad, open the installed app
• 7-tap the "AI Humanizer" title → modal appears (not a dead tap)
• Correct password → "Developer mode ON" state; limit bypassed
• Wrong password → inline "Incorrect password"
• Turn off from modal or banner → limit returns
• Same flow works in normal mobile Safari and desktop
• Python tests still pass

https://claude.ai/code/session_015REKyF6JmJchTnZWoLth7Y

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