rename symbol under cursor ('n') + save ('Ctrl+S')

- 'n' on the token under the cursor opens a rename prompt prefilled with the
  current name. The symbol is classified and routed to the right rename batch:
    * resolves to a function start        -> func
    * decompiler ref (global/string)      -> data
    * pseudocode token, not a ref         -> local (Hex-Rays lvar)
    * disasm var_/arg_                    -> stack
  tool errors (e.g. name collisions) are surfaced in the status line.
- after a rename: force_recompile + cache invalidation, reload the current views
  (preserving cursor), update the renamed function's row in place (avoids racing
  the initial stream), and update nav history names.
- 'Ctrl+S' persists the IDB (idb_save); edits mark the session dirty.
- 'n'/'N' search-repeat dropped for 'n'=rename (repeat stays on '/'+Enter / '?').
- verified live: func rename (list + disasm update), local var rename (pseudocode
  update), save. pilot suite 44/44; domain 17/17.

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