Draft: Add account name validation parser to CLI

Problem

CLI shows raw validation error instead of user-friendly message:

$ clive process transfer --to a --amount 1hbd --no-broadcast
Unhandled exception ValidationError: Expected `str` of length >= 3

Solution

Added account_name() parser in parsers.py that:

• Uses existing AccountNameValidator from TUI
• Shows friendly error message via humanize_validation_result()
• Is applied to ALL places where account name is accepted

Changes

Added account_name parser in parsers.py

def account_name(raw: str) -> str:
    status = AccountNameValidator().validate(raw)
    if status.is_valid:
        return raw
    raise typer.BadParameter(humanize_validation_result(status))

Applied parser to (16 files total):

Common templates (automatic coverage for many commands):

• arguments.py: working_account_template
• options.py: working_account_template, working_account_list_template, new_account_name
• argument_related_options.py: --name option for clive show witness --name <witness_name>

Direct parameter usage:

• process/main.py: transfer --to, change-recovery-account --new-recovery-account
• process/proxy.py: proxy set --proxy
• process/vote_witness.py: vote-witness add/remove --witness-name
• process/custom_operations/custom_json.py: custom-json --authorize-by-active
• process/update_authority.py: update-*-authority add-account/remove-account/modify-account --account
• process/hive_power/delegations.py: delegations set/remove --delegatee
• configure/profile.py: profile create --working-account-name
• configure/working_account.py: working-account switch
• configure/tracked_account.py: tracked-account add/remove
• configure/known_account.py: known-account add/remove
• generate/main.py: generate key-from-seed
• show/main.py: show witness / --name

Added unit tests

• tests/unit/cli/test_parsers.py - tests for account_name parser:
  • Valid account names (alice, bob, gtg, etc.)
  • Invalid account names (too short, special characters, uppercase, etc.)
  • User-friendly error messages (no raw ValidationError)
  • PERFORM_WORKING_ACCOUNT_LOAD placeholder passthrough

Result

Before:

Unhandled exception ValidationError: Expected `str` of length >= 3

After:

Invalid value for '--to': Invalid account name

Testing

Validation works for all commands accepting account name:

• clive process transfer --to <invalid>
• clive process savings deposit --from <invalid> --to <invalid>
• clive process vote-witness add --witness-name <invalid>
• clive process delegations set --delegatee <invalid>
• clive configure tracked-account add <invalid>
• clive show balances <invalid>
• clive show witness --name <invalid>
• etc.

Closes #484

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