feat(fuzzy): interactive fuzzy-search TUI for password store

[vollate]

Summary

Add an interactive fuzzy-search TUI that opens when pars is invoked with no subcommand (replacing the old default ls behavior). The feature is gated by feature_config.fuzzy_search and falls back to cmd_ls when disabled.

Highlights

• Live fuzzy filtering with fzf-style tiered ranking: exact match > contiguous substring > nucleo subsequence; matched character indices drive the highlight (no greedy local re-scan).
• Action popup per entry — Copy, Display, QR, Edit, Regenerate — with lazy decryption (PGP only runs when an action that needs the plaintext is chosen).
• New-entry creation (Generate / Insert) via a separate name-input popup (Ctrl-G / Ctrl-N), with overwrite confirmation when an entry already exists.
• Vim mode (feature_config.vim_mode): Esc/i mode toggle, j/k, g/G, dd/D to clear input, Ctrl-U/D/F/B half/full page nav.
• Mouse support: scroll, single-click to position cursor, double-click to open action popup, click-outside-popup to dismiss.
• Display view is now a dedicated full-screen viewer (no popup over the list) so terminal-native multi-line text selection grabs only password text — no border glyphs, no neighboring entry names.
• Clean editor handoff: cmd_edit, cmd_generate, cmd_insert run with the alt-screen torn down so vim/nano render correctly; full screen refresh on every mode transition.
• Vim-like clean exit: terminal cleared, alt-screen left, mouse capture released, cursor restored.
• Windows ConPTY fix: drop non-KeyEventKind::Press events at the top of the loop so the Enter that launched the binary doesn't get re-delivered as a release and auto-select the first entry.
• Configurable: exit_on_copy (default off), vim_mode (default off), fuzzy_search (default on); env overrides PARS_VIM_MODE, PARS_NO_FUZZY.
• Improved error message for the external-subcommand path so unknown command names produce a readable Failed to execute external command 'name': ....

Module layout (cli/src/fuzzy/)

• mod.rs — public entry, terminal setup/teardown, AppMode enum
• app.rs — App state, PendingAction, PopupRect hit-testing
• entries.rs — store walk + tiered fuzzy filter
• events.rs — main event loop and per-mode handlers
• actions.rs — copy / display / qr / edit / regenerate / generate-new / insert-new + lazy-decrypt + y/N reader
• ui.rs — all ratatui rendering (search bar, list with match highlights, action popup, name-input popup, full-screen display view, confirmation card)

Test plan

• cargo build and cargo test clean
• Run pars with an empty store → friendly message, no panic
• Run pars with entries → live filter, arrow + j/k + scroll navigation
• Enter / double-click a row → action popup opens; verify decryption happens only on Copy/Display/QR
• Copy → clipboard populated; respects exit_on_copy
• Display → full-screen viewer; multi-line mouse selection contains only password text (no │/║, no other entry names)
• QR → renders; native text selection works on it as well
• Edit → vim/nano launches and TUI restores cleanly
• Regenerate → confirmation card visible, password updates, message shown
• Ctrl-G / Ctrl-N → name-input popup; overwrite confirmation when entry exists
• Vim mode: Esc → Normal, i → Insert; dd, D, Ctrl-U/D/F/B, g/G
• Windows PowerShell: cargo run does NOT auto-open the action popup on launch
• q / Ctrl-C exit cleanly with no leftover screen artifacts

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