Prevent mobile input auto-zoom and add share-success haptic feedback

[Copilot]

Mobile users were seeing unintended page zoom when focusing the text-share input, and there was no tactile feedback after a successful share. This update addresses both in the upload/share UX path.

• Mobile zoom behavior

  • Increased text-share textarea font size from 15px to 16px in TextShare.vue to avoid iOS focus-triggered auto-zoom while preserving user zoom capability.

• Share success feedback

  • Added a unified haptic cue in home/index.vue by triggering vibration in the shared success handler used by both text and file share flows.
  • Guarded with feature detection to avoid runtime issues on unsupported platforms.

• Implementation sketch

  const triggerShareSuccessHaptic = () => {
    if (typeof navigator.vibrate === 'function') navigator.vibrate(35)
  }
  
  const handleShareSuccess = async (result: ShareResult) => {
    // ...existing success flow
    showShareDialog.value = true
    triggerShareSuccessHaptic()
  }

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.