feat(mako-history): hide dismissed entries; consolidate keybinds

Two behaviour changes:

- Hide entries that were previously dismissed via the picker (the
  state file now acts as a hide-list, not a marker). The list shrinks
  as you process it; no more grey ' ' rows clogging the view.
- Drop the secondary Alt-c custom key. wofi's '--define key_custom_N'
  appears unreliable past N=0, so Alt-c and Alt-d both silently
  failed. Reduce to a single custom slot (Alt-d) and remap actions:
    Enter -> copy + dismiss  (was: re-emit + mark seen)
    Alt-d -> dismiss without copy
  Re-emit was rarely useful given mako already shows the bubble on
  arrival; copying is the common need.

KEYBINDS.md updated to reflect the new action set.

0 files changed, 0 insertions, 0 deletions