Add EXIF mouse-over tooltip to the normal image view

The details view already showed a title="" hover summary (camera, aperture,
ISO, shutter, date) on its image; the normal image view did not. Wire the
same tooltip into view.tmpl:

- render_view_page now computes the EXIF tooltip via photo_exif_tooltip_text
  (reusing the shared identify cache, so no extra ImageMagick work) and passes
  it as the exif_tooltip context var.
- exif_tooltip is now a required render field for the view template too.
- view.tmpl adds the title="" attribute to its <img> when the summary is
  non-empty, mirroring details.tmpl (no title when there is no EXIF).
- Tests: extend the EXIF render test to assert the view image carries the same
  tooltip, and update the required-context-vars expectation for view.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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