refactor(ui): break up large functions in ui package

Go/MEDIUM task (UUID d8b51046): several functions exceeded 50 lines.
Extract logical sections into focused helpers:

renderTaskDetail() (238→20 lines): delegates to detailStyles(),
renderDetailFieldRows() + per-field helpers (Priority, Tags, Due,
Project, Recur), renderDetailDescription(), renderDetailAnnotations(),
renderDetailFooter().

handleDetailFieldEdit() (128→32 lines): uses switch + shared activation
helpers (activatePriorityEdit, activateDueEdit, activateTagsEdit,
activateProjectEdit, activateRecurEdit, handleDetailDynamicFields).

handleEnterOrEdit() (120→42 lines): reuses the same shared helpers from
handlers.go; adds a taskStr closure to remove repetitive nil-guards.

View() (82→25 lines): extracts appendInlineInputOverlay() that iterates
the active editing overlays and appends the focused widget to the layout.

Also fix hardcoded Description blink index (was always 9); introduce
detailDescriptionFieldIndex() which returns 9 or 10 depending on whether
the task has a Recurrence field, matching the dynamic render position.
Clarify that Annotations are read-only in the detail view.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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