fix eglot timer errors: remove ELPA overrides for built-in packages

straight-use-package with :type built-in for eglot, flymake, jsonrpc,
eldoc, external-completion, and seq was pulling newer ELPA versions
(eglot 1.21 vs built-in 1.17.30) that are incompatible with
flycheck-eglot and the existing config. Removed those declarations
and deleted the straight repos/builds so Emacs 30.2 built-ins are used.

Also: fix flycheck-rust-setup to only run in rust-mode buffers,
remove tmr-mode-line-mode (conflicts with maple-modeline tab-line),
and update tmr-timer segment to query timers directly.

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