strings: F2 widens the strings browser to the whole project

Completes phase 2 — the index already carried strings (KIND_STRING), the palette
just didn't offer the toggle. StringsPalette now mirrors SymbolPalette: F2 flips
between this binary and the project, project rows are prefixed with their binary,
and choosing a literal in another binary switches to it and jumps.

Ranking matches the symbol side: the trigram index guarantees the match, so
ordering is earliest-match then shortest, with a (binary, addr) tiebreak — the
same tie that crashed symbol search when two binaries shared a name, avoided here
by construction. Project scope caps at 60 like symbols.

_results is now (binary, addr, text) tuples in both palettes, so _on_string_chosen
takes the same (binary, addr) choice and routes through _switch_then_goto.

test_project_ui.py: local scope stays single-binary, F2 spans >=2 binaries
(23 checks). Suite 191/0.

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