Tooltip readability fixes + clearer Batch Analysis crop warning

[linkmodo]

Four small UX fixes across tooltips and the Batch Analysis dialog.

Tooltip keyboard shortcuts

• Shortcut chips used to butt directly against the tooltip text. They now sit on their own line below the text, still inside the tooltip box.
• When an action has two bindings they're separated with "&" (previously they ran together).
• The "&" separator inherits the tooltip text colour so it's legible (the key chips stay greyed).
• The shortcut row is right-aligned to balance the box against the left-aligned label.

Crosstalk "Matrix" tooltip wrapping

The Crosstalk Matrix tooltip was a long plain-text string. Qt only word-wraps tooltips it treats as rich text, so it rendered as a single line that ran across the whole screen. It's now wrapped in a fixed-width table so Qt word-wraps it to the controls-panel width.

Batch Analysis warning

The Batch Analysis confirmation dialog now:

• Leads with the crop-status count (e.g. "0 of 12 files are cropped").
• Strongly recommends cropping every image in the session first, explaining that uncropped frames leave the Analysis Buffer to trim only a small centered margin — so sprocket holes and empty space outside the frame get pulled into the luma/colour average and skew the result for the whole roll.
• Retains the note that the Analysis Buffer and Luma Range Clip from the current frame are applied to every file before averaging.

Tests

tests/test_shortcut_registry.py extended for the new tooltip layout (own line, "&" separator, right-alignment, plain-text passthrough). Lint clean.